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DTSTART;TZID=UTC:20201104T153000
DTEND;TZID=UTC:20201104T163000
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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:20201106T160000
DTEND;TZID=America/Halifax:20201106T170000
DTSTAMP:20260614T130801
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=America/Halifax:20201118T150000
DTEND;TZID=America/Halifax:20201118T163000
DTSTAMP:20260614T130801
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=UTC:20201118T153000
DTEND;TZID=UTC:20201118T163000
DTSTAMP:20260614T130801
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:20201125T130000
DTEND;TZID=America/Halifax:20201125T140000
DTSTAMP:20260614T130801
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:20201125T153000
DTEND;TZID=UTC:20201125T163000
DTSTAMP:20260614T130801
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:20201127T160000
DTEND;TZID=America/Halifax:20201127T170000
DTSTAMP:20260614T130801
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
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