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: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 BEGIN:DAYLIGHT TZOFFSETFROM:-0400 TZOFFSETTO:-0300 TZNAME:ADT DTSTART:20220313T060000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0300 TZOFFSETTO:-0400 TZNAME:AST DTSTART:20221106T050000 END:STANDARD END:VTIMEZONE BEGIN:VTIMEZONE TZID:UTC BEGIN:STANDARD TZOFFSETFROM:+0000 TZOFFSETTO:+0000 TZNAME:UTC DTSTART:20190101T000000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Halifax:20210224T130000 DTEND;TZID=America/Halifax:20210224T140000 DTSTAMP:20260610T180143 CREATED:20200706T160843Z LAST-MODIFIED:20210212T175656Z UID:5781-1614171600-1614175200@aarms.math.ca SUMMARY:Atlantic GR Seminar: Sarah Muth (MUN) DESCRIPTION:Marginally Outer Trapped (Open) Surfaces in 4+1 Dimensional Schwarzschild\nIn the case of binary black hole mergers\, the surface of most obvious interest\, the Event Horizon\, is often computationally difficult to locate. Instead\, it is useful to turn to quasi-local characterizations of black hole boundaries\, such as Marginally Outer Trapped Surfaces (MOTS)\, which are defined for a single time slice of the spacetime\, and the outer-most of which is the apparent horizon. In this talk\, I will describe ongoing work focused on understanding MOTS in the interior of a five-dimensional Schwarzschild black hole. Similar to the four-dimensional case previously studied\, we find examples of self-intersecting MOTS with an arbitrary number of self-intersections. This provides further support that self-intersecting behavior is rather generic. I will also briefly discuss the next stage of our research\, which involves further examples of these self-intersecting MOTS\, this time in the full Kruskal extension of Schwarzschild. \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-2021-02-24/ LOCATION:Zoom seminar CATEGORIES:Atlantic GR Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20210217T103000 DTEND;TZID=America/Halifax:20210217T113000 DTSTAMP:20260610T180143 CREATED:20200615T150024Z LAST-MODIFIED:20210212T194831Z UID:5749-1613557800-1613561400@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: JC Loredo-Osti (Memorial) DESCRIPTION:Covid-19 management in Newfoundland and Labrador\nAtlantic Canada and the territories have experienced a qualitatively different COVID-19 epidemic than the other Canadian provinces. The question is\, do these differences suggest different best approaches to public health policy or they are just the consequence of geographic/demographic conditions? When infection prevalence is low\, imported infections are not only a large fraction of all infections\, but a major trigger of outbreaks. This also posses questions about the merits of travel restrictions as well as the escalation of measures in response to outbreaks. On this presentation\, we will discuss some of the ways to quantify these issues in the context of the pandemic in Atlantic Canada\, and in particular in Newfoundland and Labrador. \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details.  All times are given in the Atlantic timezone. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2021-02-17/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20210210T153000 DTEND;TZID=UTC:20210210T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20210212T180031Z UID:5732-1612971000-1612974600@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr Anthony Bonato\, Ryerson University DESCRIPTION:The localization game played on graph\nGraph searching investigates combinatorial models for the detection or neutralization of an adversary’s activity on a network. One such model is the localization game\, where pursuers use distance probes to capture an invisible evader. We present new results on the localization number of a graph\, which is the minimum number of pursuers needed to capture the evader. We survey what is known and unknown for the localization number\, discuss connections with the chromatic number\, and give bounds on graph families such as hypercubes\, incidence graphs of combinatorial designs\, and Kneser 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-2021-02-10/ 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:20210203T103000 DTEND;TZID=America/Halifax:20210203T113000 DTSTAMP:20260610T180143 CREATED:20200615T150024Z LAST-MODIFIED:20210202T025813Z UID:5747-1612348200-1612351800@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Sanjeev Seahra (UNB) DESCRIPTION:COVID-19 modelling in New Brunswick and elsewhere\nWe present a simple differential equation based model of the COVID-19 pandemic that allows for time-evolving social distancing.  We apply the model to the first 80 days of the pandemic in 24 different jurisdictions to quantify the effectiveness of government lockdowns in March 2020.  Using Bayesian methods\, we then estimate model parameters relevant to the current outbreak in New Brunswick. \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details.  All times are given in the Atlantic timezone. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2021-02-03/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20210129T160000 DTEND;TZID=America/Halifax:20210129T170000 DTSTAMP:20260610T180143 CREATED:20200904T115630Z LAST-MODIFIED:20201231T203710Z UID:5687-1611936000-1611939600@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Alan Lindsay (Notre Dame) DESCRIPTION:The 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-2021-01-29/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20210127T153000 DTEND;TZID=UTC:20210127T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20210127T180340Z UID:5730-1611761400-1611765000@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Jordan Barrett\, PhD Candidate\, McGill University DESCRIPTION:The 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-2021-01-27/ 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:20210122T160000 DTEND;TZID=America/Halifax:20210122T170000 DTSTAMP:20260610T180143 CREATED:20200904T115630Z LAST-MODIFIED:20201231T211013Z UID:5685-1611331200-1611334800@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Allan Greenleaf (Rochester) DESCRIPTION:The 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-2021-01-22/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20210120T153000 DTEND;TZID=UTC:20210120T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20210127T180143Z UID:5727-1611156600-1611160200@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr. Hugh Thomas\, UQAM DESCRIPTION:Dynamical algebraic combinatorics and independence sets of graphs\nDynamical algebraic combinatorics is a relatively new (and fun!) topic\, which looks at cyclic group actions on objects from algebraic combinatorics\, inspired by some questions coming from dynamical systems. I will give an introduction to the area\, focusing on an action I have defined with Nathan Williams on the independent sets of a graph (arXiv:1805.00815). We also construct a partial order on the set of independent sets of a graph\, which may be of independent interest. \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-2021-01-20/ LOCATION:Zoom seminar CATEGORIES:Atlantic Graph Theory Seminar ORGANIZER;CN="Jason Brown":MAILTO:jason.brown@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20210113T153000 DTEND;TZID=UTC:20210113T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20210127T175821Z UID:5724-1610551800-1610555400@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr Stephen Finbow\, Saint Francis Xavier University DESCRIPTION:The γ-graph of a graph\nFor a graph G = (V\, E)\, the γ-graph of G\, G(γ) = (V (γ)\, E(γ))\, is the reconfiguration graph whose vertex set is the collection of minimum dominating sets\, or γ-sets of G\, and two γ-sets are adjacent in G(γ) if they differ by a single vertex and the two different vertices are adjacent in G. The γ-graph of G was introduced by Fricke et al. in 2011 where they studied properties of γ-graphs\, and raised seven questions. In this seminar we will discuss the study of γ-graphs to date with a focus on the progress of these questions. \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-2021-01-13/ 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:20201216T150000 DTEND;TZID=America/Halifax:20201216T163000 DTSTAMP:20260610T180143 CREATED:20200615T150024Z LAST-MODIFIED:20201207T122128Z UID:5643-1608130800-1608136200@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Ali Gharouni (McMaster) DESCRIPTION:COVID-19 Outbreak Dynamics and Testing-Isolation Efficacy; Insights from a Simple Epidemic Model\nOne of the main challenges in understanding COVID-19 dynamics is to estimate changes in the total level of infection in a population. The daily case count is a highly accessible form of data where observations are driven by two types of processes: (i) epidemic processes and (ii) testing processes. The challenge is then to separate these processes and understand how they interact. We developed a model that incorporates mechanistic processes of epidemic processes and testing. We have used the model to study the potential\neffect of testing strategies on disease dynamics. In future work\, we will develop improved methods for estimating true incidence by using data from negative as well as positive tests. \nIn collaboration with: Fady Abdelmalek and Drs Benjamin M Bolker\, Jonathan Dushoff\, David JD Earn \nThis is a virtual zoom seminar.  If you would like to attend\, please email the organizers for connection details.  All times are given in the Atlantic timezone. URL:https://aarms.math.ca/event/aarms-covid-19-seminar-2020-12-16/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201209T153000 DTEND;TZID=UTC:20201209T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20201231T210934Z UID:5694-1607527800-1607531400@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr Erin Meger (Université du Québec à Montréal) DESCRIPTION:The Iterated Local Model for Social Networks\nComplex networks are said to exhibit four key properties: large scale\, evolving over time\, small world properties\, and power law degree distribution. The Preferential Attachment Model (Barab´asi–Albert\, 1999) and the ACL Preferential Attachment Model (Aiello\, Chung\, Lu\, 2001) for random networks\, evolve over time and rely on the structure of the graph at the previous time step. Further models of complex networks include: the Iterated Local Transitivity Model (Bonato\, Hadi\, Horn\, Pralat\, Wang\, 2011) and the Iterated Local Anti-Transitivity Model (Bonato\, Infeld\, Pokhrel\, Pralat\, 2017). In this talk\, we will define and discuss the Iterated Local Model. This is a generalization of the ILT and ILAT models\, where at each time step edges are added deterministically according to the structure of the graph at the previous time step. \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-2020-12-09/ 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:20201204T160000 DTEND;TZID=America/Halifax:20201204T170000 DTSTAMP:20260610T180143 CREATED:20200904T115630Z LAST-MODIFIED:20201231T203053Z UID:5475-1607097600-1607101200@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Peter Hintz (MIT) DESCRIPTION:Title: Linear stability of slowly rotating Kerr spacetimes\nAbstract: I will describe joint work with Dietrich Häfner and András Vasy in which we study the asymptotic behavior of linearized gravitational perturbations of Schwarzschild or slowly rotating Kerr black hole spacetimes. We show that solutions of the linearized Einstein equation decay at an inverse polynomial rate to a stationary solution (given by an infinitesimal variation of the mass and angular momentum of the black hole)\, plus a pure gauge term. The proof uses a detailed description of the resolvent of an associated wave equation on symmetric 2-tensors near zero energy. \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-2020-10-16-2-2-2-3/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201202T153000 DTEND;TZID=UTC:20201202T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20201231T204813Z UID:5691-1606923000-1606926600@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr Melissa Huggan (Ryerson University) DESCRIPTION:The Cheating Robot and Insider Information\nThroughout this talk\, we explore a deterministic model as an alternative approach to studying simultaneous play combinatorial games. We call this the Cheating Robot model. This model forces both players to move at the same time\, but one player has extra information about where their opponent is going to move and can react accordingly. We discuss some general theory and explore a case study to get some insight into this model. This is joint work with Richard J. Nowakowski. \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-2020-12-02/ 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:20201127T160000 DTEND;TZID=America/Halifax:20201127T170000 DTSTAMP:20260610T180143 CREATED:20200904T115630Z LAST-MODIFIED:20201123T152316Z UID:5472-1606492800-1606496400@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Graham Cox (Memorial University) DESCRIPTION:Title: Nodal deficiency via equipartition energy functionals and the Dirichlet-to-Neumann map\nAbstract: A classic result in differential equations is that the nth eigenfunction\nof a Sturm-Liouville boundary value problem has precisely n-1 zeros.\nCourant’s nodal domain theorem provides a natural generalization of this\nresult to higher dimensions\, but it is generally not sharp. The lack of\nsharpness is measured by the “nodal deficiency” of an eigenfunction.\nDespite over a century of intensive study\, this quantity is still not\nvery well understood. \nThe first explicit formula for the nodal deficiency was obtained in 2012\nby Berkolaiko\, Kuchment and Smilansky\, using an energy functional\ndefined on the space of equipartitions. More recently\, with Jones and\nMarzuola\, I obtained another formula for the nodal deficiency\, in terms\nof Dirichlet-to-Neumann operators defined on the eigenfunction’s nodal\ndomains. While originally derived using symplectic methods\, this result\ncan also be understood using the spectral flow generated by a family of\nboundary conditions imposed on the nodal set. In this talk I will\ndescribe this flow\, and explain how it provides a concrete mechanism by\nwhich low energy eigenfunctions do or do not contribute to the nodal\ndeficiency. I will also describe recent progress relating these two\nformulas for the nodal deficiency\, and hint at some applications to the\ntheory of spectral minimal partitions. \nThis talk represents joint work with Thomas Beck\, Gregory Berkolaiko\,\nIsabel Bors\, Yaiza Canzani\, Grace Conte\, Christopher Jones and Jeremy\nMarzuola. \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-2020-10-16-2-2-2/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201125T153000 DTEND;TZID=UTC:20201125T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20201231T162125Z UID:5664-1606318200-1606321800@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Dr Jared Howell (Memorial University of Newfoundland\, Grenfell Campus) DESCRIPTION:Gracefully labelling windmills using Skolem-like sequences\nTo gracefully label a graph G\, assign each vertex v ∊ V(G) a distinct label l(v) from {0\,1\,2\,…\,|E(G)|}\, such that {|l(u)-l(v)| : uv ∊ E(G)}={1\,2\,3\,…\,|E(G)|}. In this talk we will examine constructive techniques using Skolem-like sequences to gracefully label windmills of cycles. This includes new constructive techniques for known results as well as new results on windmills with vanes of mixed cycle length. \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-2020-11-25/ 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:20201125T130000 DTEND;TZID=America/Halifax:20201125T140000 DTSTAMP:20260610T180143 CREATED:20200706T160843Z LAST-MODIFIED:20201108T225205Z UID:5390-1606309200-1606312800@aarms.math.ca SUMMARY:Atlantic GR Seminar: Jinzhao Wang (ETH Zurich) and Saikat Mondal (MUN) DESCRIPTION:Outer entropy equals Bartnik-Bray inner mass\, and the gravitational ant conjecture\nJinzhao Wang (ETH Zurich) \nEntropy and energy are found to be closely tied on our quest for quantum gravity. We point out an interesting connection between the recently proposed outer entropy\, a coarse-grained entropy defined for a compact spacetime domain motivated by the holographic duality\, and the Bartnik-Bray quasilocal mass long known in the mathematics community. In both scenarios\, one seeks an optimal spacetime fill-in of a given closed\, connected\, spacelike\, codimension-two boundary. We show that for an outer-minimizing mean-convex surface\, the Bartnik-Bray inner mass matches exactly with the irreducible mass corresponding to the outer entropy. The equivalence implies that the area laws derived from the outer entropy are mathematically equivalent as the monotonicity property of the quasilocal mass. It also gives rise to new bounds between entropy and the gravitational energy\, which naturally gives the gravitational counterpart to Wall’s ant conjecture. We also observe that the equality can be achieved in a conformal flow of metrics\, which is structurally similar to the Ceyhan-Faulkner proof of the ant conjecture. We compute the small sphere limit of the outer entropy and it is proportional to the bulk stress tensor as one would expect for a quasilocal mass. \nMarginally outer trapped (open) surfaces in Schwarzschild geometry and extreme mass ratio merger\n Saikat Mondal (MUN) \nBlack holes are one of the common objects in astrophysics. Some are formed from a dying star\, called a stellar black hole. There are also supermassive black holes consisting of mass millions or even billions times that of the sun. Such black holes are thought to lie at the center of almost every galaxy. In this talk we will explore the evolution of horizons of black hole mergers in a special limit called the ” extreme mass ratio” limit. For example\, a supermassive black hole merges with a stellar black hole to become a single black hole. In this limit\, the merging horizons can be studied with the help of simple numerics. We will discuss mainly about marginally outer trapped surfaces (MOTS). Interestingly\, the MOTSs we find in our numerical analysis have an arbitrary number of self-intersections. \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-2020-11-25/ LOCATION:Zoom seminar CATEGORIES:Atlantic GR Seminars END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201118T153000 DTEND;TZID=UTC:20201118T163000 DTSTAMP:20260610T180143 CREATED:20201006T115021Z LAST-MODIFIED:20201108T230211Z UID:5573-1605713400-1605717000@aarms.math.ca SUMMARY:Atlantic Graph Theory Seminar: Kyle MacKeigan (PhD Candidate\, Dalhousie University) DESCRIPTION:Orthogonal Colourings of Graphs\nTwo colourings of a graph are orthogonal if they have the property that when two vertices receive the same colour in one colouring\, then those vertices receive distinct colours in the other colouring. In this talk\, the importance of perfect orthogonal colourings is demonstrated. Then\, perfect orthogonal colourings of Cayley graphs and tree graphs are constructed. To conclude\, it is shown how the Cartesian\, tensor\, and strong graph product can be used to generate perfect orthogonal colourings. \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-2020-11-18/ 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:20201118T150000 DTEND;TZID=America/Halifax:20201118T163000 DTSTAMP:20260610T180143 CREATED:20200615T150024Z LAST-MODIFIED:20201116T134618Z UID:5578-1605711600-1605717000@aarms.math.ca SUMMARY:AARMS COVID-19 Seminar: Shannon LeBlanc (Dept of Health NB) DESCRIPTION:Importation Risk under the Northern Lights\nTo understand the risk that an infectious traveler from other Canadian provinces and territories will enter the Northwest Territories the Government of the Northwest Territories has fitted jurisdictional reported COVID-19 transmission data to a simple SEIR model. Using the most recent epidemiological parameters for transmission we estimate the likelihood that a pre-symptomatic or asymptomatic/unreported COVID-19 case will travel to the NWT at time t. We have mapped territorial travel data collected since May 2020 to identify the points in time that our importation risk was highest. Using the output of the importation risk model we have developed a Markov tree to assist public health decision makers in understanding the risk that these travelers pose to the public based on the testing and quarantine strategies that they choose to apply. \nShannon LeBlanc is currently an Epidemiologist at the New Brunswick Department of Health who has recently worked with the government of the Northwest Territories \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-2020-11-18/ LOCATION:Zoom seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Halifax:20201106T160000 DTEND;TZID=America/Halifax:20201106T170000 DTSTAMP:20260610T180143 CREATED:20200904T115630Z LAST-MODIFIED:20201108T225930Z UID:5470-1604678400-1604682000@aarms.math.ca SUMMARY:Dalhousie-AARMS AAMP Seminar: Reem Yassawi (Open University\, London) DESCRIPTION:Title: Some tame or wild Cantor dynamical systems\n Abstract: A topological dynamical system is a pair where is a compact metric spaces and is a group or semigroup acting continuously on . One algebraic invariant of a such a dynamical system is the Ellis semigroup.  The Ellis semigroup of a topological dynamical system is defined to be the compactification of the action in the topology of pointwise convergence on the space of all function .  Tameness is a concept whose roots date back to Rosenthal’s embedding theorem\, which says that if a sequence in does not have a weakly Cauchy subsequence\, then it must be a sequence on unit vectors in .  Köhler linked the concept of tameness to the Ellis semigroup.  A system is tame if its Ellis semigroup has size at most the continuum.  Non-tame systems are very far from tame\, as they must contain a copy of \, the Stone-Cech compactification of . \nIn this talk\, I will briefly survey the properties of the Ellis semigroup that make it an interesting object to study\, and discuss recent developments concerning tameness.  I will then discuss Toeplitz shifts\, which themselves have been studied extensively in this context and is the subject of some joint work with G. Fuhrmann and J. Kellendonk. \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-2020-10-16-2-2-2-2/ LOCATION:Zoom seminar CATEGORIES:AAMP Seminar ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20201104T153000 DTEND;TZID=UTC:20201104T163000 DTSTAMP:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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:20260610T180143 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 END:VCALENDAR