BEGIN:VCALENDAR VERSION:2.0 PRODID:-// - ECPv6.16.3//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-ORIGINAL-URL:https://aarms.math.ca X-WR-CALDESC:Events for REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:UTC BEGIN:STANDARD TZOFFSETFROM:+0000 TZOFFSETTO:+0000 TZNAME:UTC DTSTART:20190101T000000 END:STANDARD END:VTIMEZONE BEGIN:VTIMEZONE TZID:America/Halifax BEGIN:DAYLIGHT TZOFFSETFROM:-0400 TZOFFSETTO:-0300 TZNAME:ADT DTSTART:20190310T060000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0300 TZOFFSETTO:-0400 TZNAME:AST DTSTART:20191103T050000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0400 TZOFFSETTO:-0300 TZNAME:ADT DTSTART:20200308T060000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0300 TZOFFSETTO:-0400 TZNAME:AST DTSTART:20201101T050000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0400 TZOFFSETTO:-0300 TZNAME:ADT DTSTART:20210314T060000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0300 TZOFFSETTO:-0400 TZNAME:AST DTSTART:20211107T050000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=UTC:20201104T153000 DTEND;TZID=UTC:20201104T163000 DTSTAMP:20260611T002410 CREATED:20201006T115021Z LAST-MODIFIED:20201108T225743Z UID:5569-1604503800-1604507400@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr Andrea Burgess (University of New Brunswick\, Saint John) DESCRIPTION:Equitably colourable cycle decompositions\n A -colouring of a decomposition of a graph is an assignment of colours to the vertices of . A colouring is equitable if each colour is represented (as closely as possible) an equal number of times on each block\, i.e. for any two colours and \, the number of vertices of colour and in any given block differ by at most 1. In this talk\, we give an overview of colourings of designs and cycle decompositions\, and present some recent joint results with Francesca Merola on the existence of equitably 2-colourable cycle decompositions of the cocktail party graph. In particular\, we give a complete existence result for equitably 2-colourable -cycle decompositions of in various cases\, including that or (mod ); is a power of 2; for a prime power; or . \nThe Atlantic Graph Theory Seminar series will take place every Wednesday from 3:30-4:30 ADT online via zoom. The talks\, provided by researchers\, postdocs and graduate students\, will be on a variety of current topics in graph theory. If you would like to give a talk or attend\, please email one of the organizers (Jason Brown and Danielle Cox). URL:https://aarms.math.ca/event/atlantic-graph-theory-seminar-2020-11-04/ LOCATION:Zoom seminar CATEGORIES:Atlantic Graph Theory Seminar ORGANIZER;CN="Jason Brown":MAILTO:jason.brown@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201030T160000 DTEND;TZID=America/Halifax:20201030T170000 DTSTAMP:20260611T002410 CREATED:20200904T115630Z LAST-MODIFIED:20201116T135614Z UID:5468-1604073600-1604077200@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Jean-Pierre Garbardo (McMaster University) DESCRIPTION:Title: Factorization of positive definite functions through convolution and the Turàn problem\n Abstract: If is a finite abelian group\, we call a subset symmetric if and whenever . We also let . We consider the problem of expressing an arbitrary positive definite function on as the convolution product of two positive definite functions\, one supported on and the other one supported on . We show that\, in the particular case where is the constant function \, this problem is related to the Tur\’an problem for positive definite functions. In the particular case of a finite abelian group\, this last problem asks the following question. Given a symmetric set \, find the maximum value of the sum if and is a positive definite function on supported on . We introduce the notion of  {\it dual Tur\’an problem for }\, which is essentially the Tur\’an problem for the set \, and show how the Tur\’an problem for and its dual are related\, and how the factorization mentioned above plays a role is solving both those problems. We will then give an overview of how these results can be extended to other abelian groups such as . \nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-2020-10-16-2-2/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201028T153000 DTEND;TZID=UTC:20201028T163000 DTSTAMP:20260611T002410 CREATED:20201006T115021Z LAST-MODIFIED:20201108T225542Z UID:5565-1603899000-1603902600@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Iain Beaton (PhD Candidate\, Dalhousie University) DESCRIPTION:The Average Order of Dominating Sets of a Graph\nThis talk focuses on the average order of dominating sets of a graph. We find the extremal graphs for the maximum and minimum value over all graphs on n vertices\, while for trees we prove that the star minimizes the average order of dominating sets. We prove the average order of dominating sets in graphs without isolated vertices is at most 3n/4\, but provide evidence that the actual upper bound is 2n/3. Finally\, we show that the normalized average\, while dense in [1/2\,1]\, tends to 1/2 for almost all graphs. \nThe Atlantic Graph Theory Seminar series will take place every Wednesday from 3:30-4:30 ADT online via zoom. The talks\, provided by researchers\, postdocs and graduate students\, will be on a variety of current topics in graph theory. If you would like to give a talk or attend\, please email one of the organizers (Jason Brown and Danielle Cox). URL:https://aarms.math.ca/event/atlantic-graph-theory-seminar-2020-10-28/ LOCATION:Zoom seminar CATEGORIES:Atlantic Graph Theory Seminar ORGANIZER;CN="Jason Brown":MAILTO:jason.brown@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201028T130000 DTEND;TZID=America/Halifax:20201028T140000 DTSTAMP:20260611T002410 CREATED:20200706T160843Z LAST-MODIFIED:20201007T215632Z UID:5388-1603890000-1603893600@aarms.math.ca SUMMARY:Atlantic GR Seminar: Turkuler Durgut (MUN) DESCRIPTION:Asymptotically Anti-de Sitter Gravitational Solitons\nIn this talk\, I will consider the stability of asymptotically anti-de Sitter gravitational solitons. These are globally stationary\, asymptotically (globally) AdS spacetimes with positive energy but without horizons. I will introduce my ongoing project investigating solutions of the linear wave equation in this class of backgrounds. I will provide analytical expressions for the behavior of the scalar field near the soliton bubble and at spatial infinity. The special BPS (supersymmetric) case will then be examined as an example of a solution where stable trapping occurs. This project is joint work with Dr. Hari K. Kunduri and Dr. Robie A. Hennigar. \nThe Atlantic General Relativity 2020 online postdoc/student seminar series is in the tradition of the annual AGR meetings\, providing a forum not only for students and postdocs to present their research and make professional contacts but also to facilitate connections and collaborations between all Atlantic Canadian relativists. The series is student-organized and includes all areas of classical and quantum gravity. Talks will occur on the last Wednesday of every month\, with each session consisting of two 30 minute talks. If you would like to attend\, please email the organizers for connection details. \nNote: all times are Atlantic Time URL:https://aarms.math.ca/event/atlantic-gr-seminar-2020-10-28/ LOCATION:Zoom seminar CATEGORIES:Atlantic GR Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201023T160000 DTEND;TZID=America/Halifax:20201023T170000 DTSTAMP:20260611T002410 CREATED:20200904T115630Z LAST-MODIFIED:20201018T164418Z UID:5465-1603468800-1603472400@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Hari Kunduri (Memorial University) DESCRIPTION:Title: Geometric inequalities for axisymmetric black holes\nAbstract: In general relativity\, isolated\, dynamical black holes arise from asymptotically flat initial data for the Einstein equations. Such data are characterized by invariants such as the ADM mass and angular momentum. When angular momentum is conserved in the evolution\, the\nstandard picture of gravitational collapse suggests an inequality relating the ADM mass and angular momentum. Such geometric inequalities have been rigorously proved for axisymmetric\, asymptotically flat maximal initial data for the vacuum Einstein equations. I will discuss recent work on extending this class of inequalities to higher dimensions\, where a number of qualitative differences arise (e.g. black holes can have non-spherical horizon topology). In particular\, I will discuss how a lower bound for the mass\, in terms of a (regularized) harmonic energy functional is obtained. \nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-2020-10-16-2/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201021T153000 DTEND;TZID=UTC:20201021T163000 DTSTAMP:20260611T002410 CREATED:20201006T115021Z LAST-MODIFIED:20201006T115021Z UID:5508-1603294200-1603297800@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr. Ben Cameron (University of Guelph) DESCRIPTION:Title: Families of graphs containing only finitely many vertex-critical graphs. \nIn this talk\, motivated by algorithmic aspects of graph colouring\, we will consider the problem of classifying vertex-critical graphs in families of graphs. We will complete a dichotomy theorem for the number of k-vertex-critical H-free graphs when H is a graph of order four. Our results also reduce the remaining open problem for graphs of all orders to two families of graphs. Toward implementing the corresponding graph colouring algorithms\, we then improve upon previous research to show tight upper bounds on the order and independence number of k-vertex-critical graphs in another family of graphs\, allowing for exhaustive generation of these graphs for k at most 7 . Joint work with Chính Hoàng and Joe Sawada URL:https://aarms.math.ca/event/atlantic-graph-theory-seminar-dr-ben-cameron-university-of-guelph/ LOCATION:Zoom seminar CATEGORIES:Atlantic Graph Theory Seminar ORGANIZER;CN="Jason Brown":MAILTO:jason.brown@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201016T160000 DTEND;TZID=America/Halifax:20201016T170000 DTSTAMP:20260611T002410 CREATED:20200904T115630Z LAST-MODIFIED:20200923T163932Z UID:5459-1602864000-1602867600@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Julie Rowlett (Chalmers\, Sweden) DESCRIPTION:Decisions and Disease\nDo you usually get a flu shot every year? Do you usually take preventive measures to avoid contracting sexually transmitted infections? It is reasonable to expect that while many people may answer `no‘ to the first question\, they may answer `yes‘ to the second question. In recent joint work with my PhD student\, Carl-Joar Karlsson\, we have discovered a mathematical explanation for these different choices. Here I will explain mathematical models we have developed that combine the spread of different types of diseases together with the evolution of human behavioral choices. These models create dynamical systems\, and the stable equilibrium points provide insights into both the spread of disease as well as the evolution of human behaviors. These insights may be relevant for both the current pandemic as well as any new diseases we may encounter in the future. \nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-2020-10-16/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201014T153000 DTEND;TZID=America/Halifax:20201014T163000 DTSTAMP:20260611T002410 CREATED:20200904T115630Z LAST-MODIFIED:20201002T185318Z UID:5488-1602689400-1602693000@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: David Pike (Memorial) DESCRIPTION:Perfect 1-Factorisations\n A matching in a graph is a subset of the edge set of such that no two edges of share a vertex. A 1-factor of a graph is a matching in which every vertex of is in one of the edges of . If is a -regular graph of even order then we can ask whether admits a 1-factorisation\, namely a partition of its edge set into 1-factors. \nSuppose that are the 1-factors of a 1-factorisation of a -regular graph . If\, for each \, the union yields a Hamilton cycle in \, then we say that is a perfect 1-factorisation. We will discuss some of the history and properties of 1-factorisations\, including the recent discovery of a perfect 1-factorisation of . \nThe Atlantic Graph Theory Seminar series will take place every Wednesday from 3:30-4:30 ADT online via zoom. The talks\, provided by researchers\, postdocs and graduate students\, will be on a variety of current topics in graph theory. If you would like to give a talk or attend\, please email one of the organizers (Jason Brown and Danielle Cox). URL:https://aarms.math.ca/event/atlantic-graph-theory-seminar-2020-10-14/ LOCATION:Zoom seminar CATEGORIES:Atlantic Graph Theory Seminar ORGANIZER;CN="Danielle Cox":MAILTO:danielle.cox@msvu.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201002T160000 DTEND;TZID=America/Halifax:20201002T170000 DTSTAMP:20260611T002410 CREATED:20200904T115630Z LAST-MODIFIED:20200927T175953Z UID:5461-1601654400-1601658000@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: John Toth (McGill University) DESCRIPTION:Title: Pointwise bounds for joint eigenfunctions of quantum completely integrable (QCI) systems \nAbstract: I will discuss some recent results on improvements in supremum bounds for joint eigenfunctions of QCI systems together with sharp exponential decay estimates away from the projections of invariant Lagrangian tori (ie. in the microlocally forbidden region). This is joint work with Jeff Galkowski. \nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-2020-10-02/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200930T150000 DTEND;TZID=America/Halifax:20200930T163000 DTSTAMP:20260611T002410 CREATED:20200615T150024Z LAST-MODIFIED:20200923T175431Z UID:5482-1601478000-1601483400@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Karen Phillips (Dept of Health and Wellness\, PEI) and Javier Sanchez (Atlantic Veterinary College\, UPEI) DESCRIPTION:The Covid-19 modeling experience in Prince Edward Island\nSince the beginning of the COVID-19 pandemic\, Atlantic Canada and particularly PEI\, has experienced a low number of cases with limited community spread. This epidemiological situation has created some unique and challenging opportunities for the modelers to address the questions of interest posed by public health officers. \nA simple SEIR model was developed to assess the magnitude of the consequences in terms of hospitalizations\, PPE\, and bed requirements under a set of scenarios that could potentially happen if community spread starts to occur in the region. The model was based on differential equations and included features such as reduction of contact rates\, self isolation\, contact tracing\, and quarantine. It also allows assessing the impact on different testing strategies and test requirements to control the outbreak. \nAlso\, a Bayesian model was also developed to assess the probability that the province was free of virus circulation given the testing carried out by the government. \nDuring this seminar will discuss how the model and modeling team addressed some of the questions of interest and describe in [some] details the mathematical models developed by the team. \n\nDr. Karen Phillips is an Epidemiologist at the Chief Public Health Office\, Prince Edward Island Department of Health and Wellness\nDr. Javier Sanchez is a Professor of Epidemiology at the Atlantic Veterinary College\, University of Prince Edward Island\n\nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-09-30/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200930T130000 DTEND;TZID=America/Halifax:20200930T140000 DTSTAMP:20260611T002410 CREATED:20200706T160843Z LAST-MODIFIED:20200903T113733Z UID:5386-1601470800-1601474400@aarms.math.ca SUMMARY:Atlantic GR Seminar: Kam To Billy Chan (MUN) DESCRIPTION:The Reissner-Nordstrom Near Horizon Geometry is a Tangent Spacetime\nThe near horizon geometry (NHG) of an extremal Reissner-Nordstrom black hole is obtained in conventional global AdS coordinates and in the coordinates of the parent spacetime. Geometrical objects\, specifically Killing vectors and spacetime points\, are mapped from the boundary and horizon of the NHG into the parent spacetime coordinates. The outcome is that the NHG is a tangent spacetime to the extremal Reissner-Nordstrom black hole’s degenerate horizon and that the degenerate horizon does not bifurcate. A generalization is made for N-dimensional Reissner-Nordstrom black holes. This work is an extension of Sean Stotyn’s A Tale of Two Horizons. \nThe Atlantic General Relativity 2020 online postdoc/student seminar series is in the tradition of the annual AGR meetings\, providing a forum not only for students and postdocs to present their research and make professional contacts but also to facilitate connections and collaborations between all Atlantic Canadian relativists. The series is student-organized and includes all areas of classical and quantum gravity. Talks will occur on the last Wednesday of every month\, with each session consisting of two 30 minute talks. If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/atlantic-gr-seminar-2020-09-30/ LOCATION:Zoom seminar CATEGORIES:Atlantic GR Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200925T160000 DTEND;TZID=America/Halifax:20200925T170000 DTSTAMP:20260611T002410 CREATED:20200904T115630Z LAST-MODIFIED:20200916T212745Z UID:5427-1601049600-1601053200@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Michael Ward (UBC) DESCRIPTION:Synchrony and Oscillatory Dynamics for a 2-D PDE-ODE Model of Diffusion-Sensing with Small Signaling Compartments\nWe analyze a class of cell-bulk coupled PDE-ODE models\, motivated by quorum and diffusion sensing phenomena in microbial systems\, that characterize communication between localized spatially segregated dynamically active signaling compartments or “cells” that have a permeable boundary. In this model\, the cells are disks of a common radius and they are spatially coupled through a passive extracellular bulk diffusion field with diffusivity in a bounded 2-D domain. Each cell secretes a signaling chemical into the bulk region at a constant rate and receives a feedback of the bulk chemical from the entire collection of cells. This global feedback\, which activates signaling pathways within the cells\, modifies the intracellular dynamics according to the external environment. The cell secretion and global feedback are regulated by permeability parameters across the cell membrane. For arbitrary reaction-kinetics within each cell\, the method of matched asymptotic expansions is used in the limit of small cell radius to construct steady-state solutions of the PDE-ODE model\, and to derive a globally coupled nonlinear matrix eigenvalue problem (GCEP) that characterizes the linear stability properties of the steady-states. The analysis and computation of the nullspace of the GCEP as parameters are varied is central to the linear stability analysis. In the limit of large bulk diffusivity\, an asymptotic analysis of the PDE-ODE model leads to a limiting ODE system for the spatial average of the concentration in the bulk region that is coupled to the intracellular dynamics within the cells. Results from the linear stability theory and ODE dynamics are llustrated for Sel’kov reaction-kinetics\, where the kinetic parameters are chosen so that each cell is quiescent when uncoupled from the bulk medium. For various specific spatial configurations of cells\, the linear stability theory is used to construct phase diagrams in parameter space characterizing where a switch-like emergence of intracellular oscillations can occur through a Hopf bifurcation. The effect of the membrane permeability parameters\, the reaction-kinetic parameters\, the bulk diffusivity\, and the spatial configuration of cells on both the emergence and synchronization of the oscillatory intracellular dynamics\, as mediated by the bulk diffusion field\, is analyzed in detail. The linear stability theory is validated from full numerical simulations of the PDE-ODE system\, and from the reduced ODE model when is large. \nJoint work with Sarafa Iyaniwura (UBC) and Jia Gou (UC Riverside). \nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-2020-09-25/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200826T150000 DTEND;TZID=America/Halifax:20200826T163000 DTSTAMP:20260611T002410 CREATED:20200615T150024Z LAST-MODIFIED:20200825T010942Z UID:5162-1598454000-1598459400@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Amy Hurford (MUN) DESCRIPTION:Modelling the impact of travel restrictions on COVID-19 cases in Newfoundland and Labrador\nImported infections disproportionally contribute to coronavirus disease 2019 (COVID-19) outbreaks in regions where infection prevalence is low. On May 4th\, Newfoundland and Labrador implemented travel restrictions whereby non-residents could enter NL only with exemptions. As the prevalence of COVID-19 was low at the time\, it is likely that the travel restrictions substantially reduced the COVID-19 epidemic in NL.  We fit a stochastic epidemic model to data describing the number of active COVID-19 cases in NL from March 14th – May 4th. We then forecast the distribution of outbreak sizes over the 9 weeks subsequent to May 4th\, with and without the travel restrictions\, and for physical distancing scenarios ranging from a 40% to 70% reduction in the daily contact rate relative to pre-pandemic levels. The implementation of travel restrictions in NL resulted in a 20-fold decrease in the number of cases over the subsequent 9 weeks. Assuming that physical distancing reduced the contact rate to 55% of its pre-pandemic level\, the median number of cases without the travel restrictions was 19 and with the travel restrictions was 1. Using epidemic modelling\, we show how the NL outbreak would have unfolded had travel restrictions not been implemented. The few COVID-19 cases reported following the implementation of travel restrictions is not evidence that the travel restrictions were unnecessary; rather our modelling shows that the travel restrictions are a plausible reason why there were few reported cases in NL in the 9-weeks after May 4th. \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-08-26/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200826T130000 DTEND;TZID=America/Halifax:20200826T140000 DTSTAMP:20260611T002410 CREATED:20200706T160843Z LAST-MODIFIED:20200816T155708Z UID:5380-1598446800-1598450400@aarms.math.ca SUMMARY:Atlantic GR Seminar: Nicholas Layden (Dalhousie) and Sharmin Akhter (MUN) DESCRIPTION:Geometric Horizons in the Szekeres Spacetime\nNicholas Layden (Dalhousie University)\nA new conjecture for geometric horizons has been introduced which may provide a potential alternative to using apparent horizons and related surfaces for analyzing the dynamics of black hole spacetimes. In particular\, using two examples of black hole formation in a collapsing universe in the Szekeres spacetime\, the formation\, evolution\, and detection of geometric horizons are shown. In addition\, a function for detecting apparent horizons in the Szekeres spacetime is also considered\, and it is shown that the apparent horizon in the Szekeres model\, is in fact\, a geometric horizon. The Cartan-Karlhede algorithm for determining local equivalences of spacetimes is used to compute an invariant frame in the Newman Penrose frame formalism\, and Cartan invariants derived from the spacetime in this frame are shown to detect the geometric horizons under various conditions on the curvature tensors of the spacetime. One model for primordial black hole formation and another for galactic black hole formation are considered with non-zero cosmological constants\, generalizing work published previously on these models with zero cosmological constant. Future work utilizing geometric horizons may provide benefits in gravitational wave research involving black hole mergers. \nRigidity of Marginally Outer Trapped Surfaces in RNdS Spacetime\nSharmin Akhter (Memorial University of Newfoundland)\nWe investigate the rigidity of MOTS in four dimensional Reissner-Nordstrom-de Sitter spacetime. This is connected to the study of the first order derivative of stability operator (and hence the second derivative of outgoing null expansion). Since the stability operator has a zero eigenvalue in our case\, we use the Lyapunov-Schmidt reduction to establish rigidity. \nThe Atlantic General Relativity 2020 online postdoc/student seminar series is in the tradition of the annual AGR meetings\, providing a forum not only for students and postdocs to present their research and make professional contacts but also to facilitate connections and collaborations between all Atlantic Canadian relativists. The series is student-organized and includes all areas of classical and quantum gravity. Talks will occur on the last Wednesday of every month\, with each session consisting of two 30 minute talks. If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/atlantic-gr-seminar-2020-08-26/ LOCATION:Zoom seminar CATEGORIES:Atlantic GR Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200812T150000 DTEND;TZID=America/Halifax:20200812T163000 DTSTAMP:20260611T002410 CREATED:20200615T150024Z LAST-MODIFIED:20200811T153753Z UID:5376-1597244400-1597249800@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Acadia Covid Modelling Group DESCRIPTION:Talk 1: Estimating underreporting of COVID-19 cases using fatality data\nLed by Margaret Hopkins \nTalk 2: Individual-based modelling of COVID-19 on the Acadia University campus with a realistic contact structure\nLed by the Acadia Modelling Group \nThe Acadia Modelling Group consists of D. Currie\, C. Hooper\, M. Hopkins\, R. Karsten\, Y. Li\, F. Mendivil\, and H. Teismann.  This is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-08-12/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200812T130000 DTEND;TZID=America/Halifax:20200812T150000 DTSTAMP:20260611T002410 CREATED:20200723T140954Z LAST-MODIFIED:20200731T143654Z UID:5339-1597237200-1597244400@aarms.math.ca SUMMARY:Café Mathématique: What is a model of COVID-19? DESCRIPTION:  \nCafé Mathématique is a free\, online public forum where anyone can learn how math underpins our understanding of the COVID-19 pandemic. Hear from a panel of experts at universities across Canada as they answer the question\, “What is a model of COVID-19?”\, followed by a lively discussion where audience members are encouraged to ask questions and explore ideas about modelling the pandemic. \nPanelists: \n\nJavier Sanchez\, Associate Professor\, Epidemiology\, University of Prince Edward Island\nDavid Buckeridge\, Professor\, Epidemiology\, Biostatistics & Occupational Health\, McGill University\nAshleigh Tuite\, Assistant Professor\, Dalla Lana School of Public Health\, University of Toronto\nCaroline Colijn\, Professor and Canada 150 Research Chair\, Mathematics\, Simon Fraser University\n\nModerators: \n\nJane Heffernan\, Professor\, Mathematics and Statistics\, York University\nJude Kong\, Assistant Professor\, Mathematics and Statistics\, York University\n\nRegister at http://www.fields.utoronto.ca/activities/20-21/cafe-math-covid URL:https://aarms.math.ca/event/cafe-mathematique-what-is-a-model-of-covid-19/ ATTACH;FMTTYPE=image/png:https://aarms.math.ca/wp-content/uploads/2020/07/Cafe-Mathematiqe-What-is-a-model-of-COVID-19.png ORGANIZER;CN="James Watmough":MAILTO:watmough@unb.ca END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200810 DTEND;VALUE=DATE:20200815 DTSTAMP:20260611T002410 CREATED:20200228T161230Z LAST-MODIFIED:20200406T134546Z UID:4846-1597017600-1597449599@aarms.math.ca SUMMARY:PIMS/AARMS WORKSHOP ON New Trends in Localized Patterns in PDEs DESCRIPTION:Mathematical Theory and Applications to Physics\, Biology and the Social Sciences– a Conference in Honour of the 60th Birthday of Michael J. Ward \nLocalized spatial-temporal patterns commonly occur for various classes of linear and nonlinear diffusive processes. In particular\, they occur in reaction-diffusion (RD) systems modeling quorumsensing (QS) behavior in biological systems\, the initiation of root-hair tip formation in plant cells\, and the spatial distribution of urban crime. Localization behavior also occurs in the biophysical context of calculating first passage statistics for a Brownian walker in a region with localized traps\, and in ecology for calculating the persistence threshold of a species in a patchy landscape. In recent years\, we have witnessed an explosion of many new and exciting developments in the theory and applications of localized solutions in PDEs. Many new frontiers have opened while new connections between old fields have been discovered. \nThis workshop will highlight Prof. Ward’s influential contributions to the mathematics and applications of localized solutions to PDEs. It brings together his students\, colleagues and collaborators in a celebration of Prof. Ward’s 60th birthday. Over his long career\, Prof. Ward has made numerous invaluable contributions to many areas of applied mathematics\, including fluid dynamics\, metastability\, reaction-diffusion equations\, cell biology and pattern formation. He has supervised 13 doctoral students and also mentored numerous postdocs and undergrads. URL:https://aarms.math.ca/event/pims-aarms-workshop-on-new-trends-in-localized-patterns-in-pdes-mathematical-theory-and-applications-to-physics-biology-and-the-social-sciences-a-conference-in-honour-of-the-60th-birthday/ LOCATION:PIMS at UBC and SFU\, Vancouver\, British Columbia\, Canada CATEGORIES:AARMS sponsored events END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200806T200000 DTEND;TZID=America/Halifax:20200806T210000 DTSTAMP:20260611T002410 CREATED:20200614T162707Z LAST-MODIFIED:20200816T160017Z UID:5218-1596744000-1596747600@aarms.math.ca SUMMARY:Math Kitchen Party: organized by Connie Stewart (UNB Saint John) DESCRIPTION:Hierarchical linear model with power law function on transmission of COVID-19 in Italy: Modelling and regression analysis\nYoutian Hao (UNB Fredericton)\nCOVID-19 growth data were typically collected from each region of a country\, and the transmission rate usually varies in different area. By adopting a power law with exponential cutoff function into hierarchical linear model\, it becomes possible to reveal the relationship between COVID-19 transmission rate and some regional level covariates of interest. A two-level hierarchical linear model is constructed\, where the first level includes a PLEC function with Poisson link\, and the second level incorporates parameters from level-one with regional level covariates. Modelling and regression analysis approach is implemented based on the model with Italian COVID-19 transmission data. \nWhy Most Published Research Findings Are False\nHugh Chipman (Acadia)\nMany scientific studies declare a “statistically significant” result but then can’t be replicated. What’s going on? Can we no longer trust statistics? Is this the end of the world as we know it? \nMusical Guests\n\nMichele Millar (MSVU)\nAugusto Suarez Garcia (UNBSJ)\n\nThis is a virtual zoom meeting.  If you would like to attend\, please email the organizers for connection details. \n[more information about the Math Kitchen Party summer talk series] URL:https://aarms.math.ca/event/math-kitchen-party-2020-08-06/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200805T150000 DTEND;TZID=America/Halifax:20200805T163000 DTSTAMP:20260611T002410 CREATED:20200615T150024Z LAST-MODIFIED:20200804T235324Z UID:5374-1596639600-1596645000@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: James Watmough (UNB Fredericton) DESCRIPTION:Simple epidemic models with importation\nMany provinces and territories have controlled the spread of SARS-COV-2 within their borders and are now weighing the risks and benefits of reopening internally and externally.  In this week’s seminar I’ll lay out some groundwork for this comparison using variations on the simple SIR model. \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-08-05/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200804 DTEND;VALUE=DATE:20200815 DTSTAMP:20260611T002410 CREATED:20190925T225058Z LAST-MODIFIED:20190925T225058Z UID:4694-1596499200-1597449599@aarms.math.ca SUMMARY:Diversity in Mathematics 2020 DESCRIPTION:We propose a multi-year\, multi-level approach to promoting diversity and inclusivity in STEM. The annual two-week program encompasses concurrent\, partially overlapping events targeting two distinct groups: \n(a) A summer school for top undergraduate women in Canada and the northwest United States\, specializing in mathematics or a related STEM field such as computer science\, physics and statistics. The program will expose them to the many facets of the mathematical sciences in an intense two week immersion. Career opportunities in academia and industry will be given equal emphasis. We hope to encourage these gifted young women to continue on to graduate school\, an arena where women are still seriously under-represented. \n(b) An interactive math camp that runs as a companion program to the summer school. The target demographic here involves high school students in grades 10 and 11\, irrespective of gender\, with an aptitude for science and mathematics but from under-privileged groups. URL:https://aarms.math.ca/event/diversity-in-mathematics-2020/ LOCATION:Vancouver CATEGORIES:AARMS sponsored events ORGANIZER;CN="Malabika Pramanik":MAILTO:malabika@math.ubc.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200729T130000 DTEND;TZID=America/Halifax:20200729T140000 DTSTAMP:20260611T002410 CREATED:20200706T160843Z LAST-MODIFIED:20200730T220754Z UID:5157-1596027600-1596031200@aarms.math.ca SUMMARY:Atlantic GR Seminar: Sharmila Gunasekaran Gnanam (MUN) and Robert Santacruz (UNB) DESCRIPTION:Slow decay of waves in gravitational solitons\nSharmila Gunasekaran Gnanam\nMemorial University of Newfoundland\nGravitational solitons are globally stationary horizonless asymptotically flat spacetimes. In this talk\, I will describe the methodology used to prove that massless scalar waves in a particular family of soliton spacetimes decay very slowly. The proof involves the construction of quasimodes which are approximate solutions to the wave equation. This slow decay can be attributed to the stable trapping of null geodesics and is suggestive of instability at the nonlinear level. This is joint work with Hari Kunduri. \nQuantizing gravity is not that hard if you know how: An undergraduate guide to black holes\nRobert Santacruz\nUniversity of New Brunswick\nIt is expected that singularities appearing in GR are to be resolved in a theory of Quantum Gravity. In the context of Loop Quantum Gravity\, the Big Bang singularity is replaced by a bounce and so one would assume that this can be translated into Black Holes. In this talk I will explain you how to find an effective model for Schwarzschild black hole by using Loop Quantum Cosmology techniques and\, the best part is\, you only need Hamiltonian Mechanics!! \nThe Atlantic General Relativity 2020 online postdoc/student seminar series is in the tradition of the annual AGR meetings\, providing a forum not only for students and postdocs to present their research and make professional contacts but also to facilitate connections and collaborations between all Atlantic Canadian relativists. The series is student-organized and includes all areas of classical and quantum gravity. Talks will occur on the last Wednesday of every month\, with each session consisting of two 30 minute talks. If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/atlantic-gr-seminar-2020-07-29/ LOCATION:Zoom seminar CATEGORIES:Atlantic GR Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200723T200000 DTEND;TZID=America/Halifax:20200723T210000 DTSTAMP:20260611T002410 CREATED:20200614T162707Z LAST-MODIFIED:20200712T175157Z UID:5195-1595534400-1595538000@aarms.math.ca SUMMARY:Math Kitchen Party: organized by Asmita Sodhi (Dalhousie) and Rebecca McKay (UNB Saint John) DESCRIPTION:Tips and Tricks for Online Teaching\nRebecca McKay (UNB Saint John)\nMany of us will be teaching with some online component in Fall 2020. In this brief talk\, I will outline some tips and tricks for moving mathematics and statistics course activities into the virtual environment. \nOpen Discussion Session: 8:30-8:50\nThis is a virtual zoom meeting.  If you would like to attend\, please email the organizers for connection details. \n[more information about the Math Kitchen Party summer talk series] URL:https://aarms.math.ca/event/math-kitchen-party-2020-07-23/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200716T200000 DTEND;TZID=America/Halifax:20200716T210000 DTSTAMP:20260611T002410 CREATED:20200614T162707Z LAST-MODIFIED:20200712T174952Z UID:5186-1594929600-1594933200@aarms.math.ca SUMMARY:Math Kitchen Party: organized by Danielle Cox (Mount Saint Vincent) DESCRIPTION:Modelling correlated count data-can I delete the zeroes?\nGary Sneddon (Mount Saint Vincent)\nCorrelated count data with excess zeroes arise in a number of applications. We will discuss 3 motivating examples\, and some approaches to modelling these type of data. Covid-19 may be mentioned\, so be prepared. This is joint work with Tariqul Hasan and Renjun Ma of UNB (Fredericton). \nThe Shooter’s Hill Decorative Tiles: Combinatorics as Art\nKaryn McLellan (Mount Saint Vincent)\nThis talk will explore some of the art and mathematics inspired by a mistakenly (?) placed stone tile on a terraced house in London. A set of 70 Truchet-type tiles are the building blocks for various art pieces\, including an inkle loom weaving. In particular\, we are interested in whether or not we can weave an overlapping strip containing all 70 tiles exactly once\, and if so\, how many such strips exist. Other combinatorial properties of the tiles are examined as well. Joint work with Eva Knoll(UQAM) and Danielle Cox (MSVU). \nMusical Guests\n\nSean & Tessa Sneddon\n\nThis is a virtual zoom meeting.  If you would like to attend\, please email the organizers for connection details. \n[more information about the Math Kitchen Party summer talk series] URL:https://aarms.math.ca/event/math-kitchen-party-2020-07-16/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200715T150000 DTEND;TZID=America/Halifax:20200715T163000 DTSTAMP:20260611T002410 CREATED:20200615T150024Z LAST-MODIFIED:20200703T130123Z UID:5151-1594825200-1594830600@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Sana Jahedi (UNB) and James A. Yorke (Maryland) DESCRIPTION:When the best pandemic models are the simplest\nAs a pandemic of coronavirus spreads across the globe\, people debate policies to mitigate its severity. \nMany complex\, highly detailed models have been developed to help policy setters make better decisions. However\, the basis of these models is unlikely to be understood by non-experts. \nWe describe the advantages of simple models for covid-19. We say a model is “simple’’ if its only parameter is the rate of contact between people in the population. Such models can be understood by a broad audience\, and thus can be helpful in explaining the policy decisions to the public. They can be used to evaluate outcomes of different policy strategies. However\, simple models have a disadvantage when dealing with inhomogeneous populations. \nTo augment the power of a simple model to evaluate complicated situations\, we add what we call “satellite’’ equations that do not change the original model. \nTo compare simple models with complex models\, we introduce our “slightly complex’’ Model J. We find the conclusions of simple and complex models can be quite similar. But\, for each added complexity\, a modeler may have to choose additional parameter values for which there is often little rationale but that can have a big impact on predictions. Our simulations suggest that the added complexity offers little predictive advantage. \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-07-15/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200713 DTEND;VALUE=DATE:20200717 DTSTAMP:20260611T002410 CREATED:20200701T112508Z LAST-MODIFIED:20200701T112508Z UID:5115-1594598400-1594943999@aarms.math.ca SUMMARY:CMS COVID-19 Research and Education Meeting (CCREM) DESCRIPTION:The CMS had to postpone the 2020 CMS Summer Meeting planned for this June due to the COVID-19 pandemic. Since we cannot hold a meeting in person\, the CMS still wants to provide a virtual platform for mathematicians to come together and learn during this difficult time. We feel that a meeting focused on the changes caused by COVID-19 to the way we plan\, teach and do research would be of great benefit to the Canadian mathematical community. \nThe session will cover NSERC’s response to the COVID-19 pandemic including new funding opportunities for researchers\, changes in policies for NSERC Discovery grants and scholarship and fellowship programs. NSERC staff will also be answering questions regarding the coming Discovery grant competition. URL:https://aarms.math.ca/event/cms-covid-19-research-and-education-meeting-ccrem/ LOCATION:Virtual Meeting CATEGORIES:AARMS sponsored events ORGANIZER;CN="Kseniya Garaschuk":MAILTO:kseniya.garaschuk@ufv.ca END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200713 DTEND;VALUE=DATE:20200718 DTSTAMP:20260611T002410 CREATED:20190925T230228Z LAST-MODIFIED:20190927T130519Z UID:4704-1594598400-1595030399@aarms.math.ca SUMMARY:Quantum Gravity 2020 DESCRIPTION:The conference “Quantum Gravity 2020“ has a deliberately broad scope. We aim to include participants from all current approaches to quantum gravity\, as well as researchers working on the phenomenology of quantum gravity. The main goal of the meeting is to assess the progress made and to constructively and openly discuss open questions in our understanding of quantum gravity. \nA second goal is to work towards combining the insights gained in the various approaches. In its overall goal as well as the format\, this conference will differ from more specialized meetings that focus on specific quantum-gravity approaches. \nWe hope that this inaugural conference “Quantum Gravity“ can make a contribution to bridging the gaps between quantum gravity approaches\, and bring the entire community together for a constructive and fruitful exchange. URL:https://aarms.math.ca/event/quantum-gravity-2020/ LOCATION:Perimeter Institute for Theoretical Physics\, 31 Caroline Street North\, Waterloo\, Ontario\, N2L 2Y5\, Canada CATEGORIES:AARMS sponsored events ORGANIZER;CN="Bianca Dittrich":MAILTO:bdittrich@perimeterinstitute.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200709T200000 DTEND;TZID=America/Halifax:20200709T210000 DTSTAMP:20260611T002410 CREATED:20200614T162707Z LAST-MODIFIED:20200707T131557Z UID:5181-1594324800-1594328400@aarms.math.ca SUMMARY:Math Kitchen Party: organized by Daniele Turchetti (Dalhousie) DESCRIPTION:Number Theory in Quantum Mechanics\nSuresh Eswarathasan (Dalhousie | 8:00-8:20)\nIn this lecture\, I will discuss some concrete connections between two seemingly disparate fields: number theory and quantum mechanics. The first 10 minutes will be spent giving some “standard” facts in these disciplines before spending the last 10 minutes on the implications of the Sum of Two Squares Theorem (or rather\, its refinements) on certain quantum waves. \nGetting Back to Your Roots\nJason Brown (Dalhousie | 8:40-9:00)\nPolynomials arise in various combinatorial settings\, and their roots are of interest for both applied and theoretical reasons. In this talk I’ll provide a few examples\, and show how exploring the nature and location of the roots can connect us back to giants of the past\, such as Newton\, Gauss\, Hermite and Julia. \nMusical Interlude\n\nDorette Pronk (Dalhousie)\n\nThis is a virtual zoom meeting.  If you would like to attend\, please email the organizers for connection details. \n[more information about the Math Kitchen Party summer talk series] URL:https://aarms.math.ca/event/math-kitchen-party-2020-07-09/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200708T150000 DTEND;TZID=America/Halifax:20200708T163000 DTSTAMP:20260611T002410 CREATED:20200615T150024Z LAST-MODIFIED:20200702T182408Z UID:5126-1594220400-1594225800@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Matthew Betti (Mount Allison)* and Jane Heffernan (York) DESCRIPTION:Scenario-based modeling of healthcare demand and PPE usage during the COVID-19 pandemic\nOne of the big risks during the current pandemic is stress and overburdening of the healthcare system\, and a possible scarcity of resources. We will present a three module model that projects possible epidemic outcomes and subsequently measures healthcare demand and PPE usage for different jurisdictions across Canada. We present as well a simple model which we fit to current cases with some novel sampling techniques which allows us to narrow possible trajectories which can then be fed into the healthcare demand and PPE modules. We show results for possible outcomes from each of our three modules and from our fitting techniques. \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-07-08/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200702T200000 DTEND;TZID=America/Halifax:20200702T210000 DTSTAMP:20260611T002410 CREATED:20200614T162707Z LAST-MODIFIED:20200707T012504Z UID:5104-1593720000-1593723600@aarms.math.ca SUMMARY:Math Kitchen Party: organized by Branimir Cacic (UNB Fredericton) DESCRIPTION:The Oberwolfach Problem\nAndrea Burgess (UNB Saint John)\nThe Oberwolfach Problem was posed by Ringel as a seating problem: people attend a conference in Oberwolfach\, where the dining room has round tables of sizes (with ). Is it possible to devise a seating plan over successive dinners in which each person sits next to each other person exactly once? \nIn graph-theoretical terms\, the Oberwolfach Problem asks whether\, given a 2-factor of order \, the complete graph can be decomposed into copies of . In this talk\, we present solutions of the Oberwolfach Problem obtained via graceful labellings. This is joint work with Peter Danziger (Ryerson) and Tommaso Traetta (Brescia). \nThe Unitary Birkhoff-von Neumann theorem\nStijn De Baerdemacker (UNB Fredericton)\nBirkhoff has shown that the doubly stochastic matrices can be written as a weighted sum over the permutation matrices of the same dimension. I will show that a similar theorem holds for unitary matrices with equal linesum\, and talk about applications in quantum computing. \nMusical Guests\n\nTBA\n\nThis is a virtual zoom meeting.  If you would like to attend\, please email the organizers for connection details. \n[more information about the Math Kitchen Party summer talk series] URL:https://aarms.math.ca/event/math-kitchen-party-2020-07-02/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20200625T200000 DTEND;TZID=America/Halifax:20200625T210000 DTSTAMP:20260611T002410 CREATED:20200614T162707Z LAST-MODIFIED:20200707T012539Z UID:5089-1593115200-1593118800@aarms.math.ca SUMMARY:Math Kitchen Party: organized by Patrick Reynolds (UNB Fredericton) DESCRIPTION:Source Sink Diffusion\nDanielle Cox (MSVU)\nWe will introduce the diffusion process on graphs with the addition of sources and sinks. In particular\, we will provide some results regarding the periodicity of the process. This is joint work with Todd Mullen (Dalhousie University)\, Shayne Breen (MSVU)\, Emily Wright (MSVU) and Jesse Preston (MSVU). \nMore Fun with the Sierpinski Relatives\nTara Taylor (StFX)\nThe Sierpinski gasket is a well-known fractal that can be described as the attractor of an iterated function system (IFS) that maps the unit square to three smaller squares (scaled down by 2). A Sierpinski relative is a fractal that is an attractor of an IFS that maps the unit square to three smaller squares but also involves the symmetries of the square. This is an interesting class of fractals because they all have the same fractal dimension but different topologies. Some are totally disconnected\, some are disconnected with straight line segments\, some are simply-connected\, and some are multiply-connected. This very brief talk will explore different ways to compare and characterize the fractals that go beyond the fractal dimension. We will focus on the subclass that are disconnected with straight line segments\, and this will involve convex hulls and epsilon-hulls. \nMusical Guests\n\nPatrick Reynolds\n\nThis is a virtual zoom meeting.  If you would like to attend\, please email the organizers for connection details. \n[more information about the Math Kitchen Party summer talk series] URL:https://aarms.math.ca/event/math-kitchen-party-tim-alderson-organizer-2/ LOCATION:Zoom seminar END:VEVENT END:VCALENDAR