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SUMMARY:Sharmila Gunasekaran (Memorial University of Newfoundland)
DTSTART;VALUE=DATE-TIME:20200729T160000Z
DTEND;VALUE=DATE-TIME:20200729T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T102759Z
UID:general-relativity/1
DESCRIPTION:Title: Slow decay of waves in gravitational solitons\nby Sharm
ila Gunasekaran (Memorial University of Newfoundland) as part of Atlantic
General Relativity 2020 Online Postdoc/Student Seminar Series\n\n\nAbstrac
t\nGravitational solitons are globally stationary horizonless asymptotical
ly flat spacetimes. In this talk\, I will describe the methodology used to
prove that massless scalar waves in a particular family of soliton spacet
imes 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 o
f instability at the nonlinear level. This is joint work with Hari Kunduri
.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Santacruz (University of New Brunswick)
DTSTART;VALUE=DATE-TIME:20200729T163000Z
DTEND;VALUE=DATE-TIME:20200729T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T102759Z
UID:general-relativity/2
DESCRIPTION:Title: Quantizing gravity is not that hard if you know how: An
undergraduate guide to black holes\nby Robert Santacruz (University of Ne
w Brunswick) as part of Atlantic General Relativity 2020 Online Postdoc/St
udent Seminar Series\n\n\nAbstract\nIt is expected that singularities appe
aring in GR are to be resolved in a theory of Quantum Gravity. In the cont
ext of Loop Quantum Gravity\, the Big Bang singularity is replaced by a bo
unce 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 Schwar
zschild black hole by using Loop Quantum Cosmology techniques and\, the be
st part is\, you only need Hamiltonian Mechanics!!\n
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BEGIN:VEVENT
SUMMARY:Sharmin Akhter (Memorial University of Newfoundland)
DTSTART;VALUE=DATE-TIME:20200826T163000Z
DTEND;VALUE=DATE-TIME:20200826T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T102759Z
UID:general-relativity/3
DESCRIPTION:Title: Rigidity of Marginally Outer Trapped Surfaces in RNdS S
pacetime\nby Sharmin Akhter (Memorial University of Newfoundland) as part
of Atlantic General Relativity 2020 Online Postdoc/Student Seminar Series\
n\n\nAbstract\nWe investigate the rigidity of MOTS in four dimensional Rei
ssner-Nordstrom-de Sitter spacetime. This is connected to the study of the
first order derivative of stability operator (and hence the second deriva
tive of outgoing null expansion). Since the stability operator has a zero
eigenvalue in our case\, we use the Lyapunov-Schmidt reduction to establis
h rigidity. This is joint work with Dr. Ivan Booth and Dr. Graham Cox.\n
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BEGIN:VEVENT
SUMMARY:Kam To Billy Chan (Memorial University of Newfoundland)
DTSTART;VALUE=DATE-TIME:20200930T160000Z
DTEND;VALUE=DATE-TIME:20200930T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T102759Z
UID:general-relativity/4
DESCRIPTION:Title: The Reissner-Nordstrom Near Horizon Geometry is a Tange
nt Spacetime\nby Kam To Billy Chan (Memorial University of Newfoundland) a
s part of Atlantic General Relativity 2020 Online Postdoc/Student Seminar
Series\n\n\nAbstract\nThe near horizon geometry (NHG) of an extremal Reiss
ner-Nordstrom black hole is obtained in conventional global AdS coordinate
s and in the coordinates of the parent spacetime. Geometrical objects\, sp
ecifically Killing vectors and spacetime points\, are mapped from the boun
dary and horizon of the NHG into the parent spacetime coordinates. The out
come is that the NHG is a tangent spacetime to the extremal Reissner-Nords
trom black hole’s degenerate horizon and that the degenerate horizon doe
s not bifurcate. A generalization is made for N-dimensional Reissner-Nords
trom black holes. This work is an extension of Sean Stotyn’s A Tale of T
wo Horizons.\n
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SUMMARY:Turkuler Durgut (Memorial University of Newfoundland)
DTSTART;VALUE=DATE-TIME:20201028T160000Z
DTEND;VALUE=DATE-TIME:20201028T163000Z
DTSTAMP;VALUE=DATE-TIME:20201029T102759Z
UID:general-relativity/5
DESCRIPTION:Title: Asymptotically Anti-de Sitter Gravitational Solitons\nb
y Turkuler Durgut (Memorial University of Newfoundland) as part of Atlanti
c General Relativity 2020 Online Postdoc/Student Seminar Series\n\n\nAbstr
act\nIn this talk\, I will consider the stability of asymptotically anti-d
e Sitter gravitational solitons. These are globally stationary\, asymptoti
cally (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 exp
ressions for the behavior of the scalar field near the soliton bubble and
at spatial infinity. The special BPS (supersymmetric) case will then be ex
amined as an example of a solution where stable trapping occurs. This proj
ect is joint work with Dr. Hari K. Kunduri and Dr. Robie A. Hennigar.\n
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