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DTSTART;TZID=America/Halifax:20210331T130000
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CREATED:20200706T160843Z
LAST-MODIFIED:20210325T140122Z
UID:5783-1617195600-1617199200@aarms.math.ca
SUMMARY:Atlantic GR Seminar: Dr Robie Hennigar (MUN)
DESCRIPTION:Holographic Complexity and Thermodynamic Volume\nI will discuss recent work exploring the holographic complexity conjectures for rotating black holes. A relationship between the complexity of formation and the thermodynamic volume of the black hole is found\, and I discuss the evidence that suggests this relationship holds generally. This is one of the first connections between thermodynamic volume and holography\, and I will discuss possible implications. \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-2021-03-31/
LOCATION:Zoom seminar
CATEGORIES:Atlantic GR Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20210224T130000
DTEND;TZID=America/Halifax:20210224T140000
DTSTAMP:20210212T175656Z
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:20201125T130000
DTEND;TZID=America/Halifax:20201125T140000
DTSTAMP:20201108T225205Z
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
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DTSTART;TZID=America/Halifax:20201028T130000
DTEND;TZID=America/Halifax:20201028T140000
DTSTAMP:20201007T215632Z
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
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DTSTART;TZID=America/Halifax:20200930T130000
DTEND;TZID=America/Halifax:20200930T140000
DTSTAMP:20200903T113733Z
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:20200826T130000
DTEND;TZID=America/Halifax:20200826T140000
DTSTAMP:20200816T155708Z
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:20200729T130000
DTEND;TZID=America/Halifax:20200729T140000
DTSTAMP:20200730T220754Z
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
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