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SUMMARY:Suvodip Mukherjee (University of Amsterdam)
DTSTART:20200501T120000Z
DTEND:20200501T130000Z
DTSTAMP:20260404T095848Z
UID:CambridgeFriGR/1
DESCRIPTION:Title: Multi-messenger cosmology: A new frontier\nby Suvodip Mu
kherjee (University of Amsterdam) as part of DAMTP Friday GR seminar\n\n\n
Abstract\nCosmic microwave background and large scale structure observatio
ns have played a crucial role in constructing the standard model of cosmol
ogy. Discovery of astrophysical gravitational waves has opened a new avenu
e to explore the cosmos using transients. In my talk\, I will discuss a fe
w new frontiers in the field of physical cosmology and fundamental physics
which can be explored using gravitational waves from the ongoing LIGO -Vi
rgo observatory and with the future gravitational wave missions such as LI
SA \, Einstein Telescope and Cosmic Explorer. I will elucidate the existen
ce of synergies between the electromagnetic signals and gravitational wave
signals and its importance in understanding the standard model of cosmolo
gy.\n\nIf you have a question about this talk\, please contact Chandrima Ganguly.\n
LOCATION:https://stable.researchseminars.org/talk/CambridgeFriGR/1/
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SUMMARY:Aron Kovacs (University of Cambridge)
DTSTART:20200508T120000Z
DTEND:20200508T130000Z
DTSTAMP:20260404T095848Z
UID:CambridgeFriGR/2
DESCRIPTION:Title: Well-posed formulation of scalar-tensor effective field theo
ry\nby Aron Kovacs (University of Cambridge) as part of DAMTP Friday G
R seminar\n\n\nAbstract\nEffective field theory provides a way of paramete
rizing strong-field deviations from General Relativity that might be obser
vable in the gravitational waves emitted in a black hole merger. To perfor
m numerical simulations of mergers in such theories it is necessary that t
he equations be written in a form that admits a well-posed initial value f
ormulation. In this talk\, I will focus on gravity coupled to a scalar fie
ld including the leading (4-derivative) effective field theory corrections
(this theory is referred to as Einstein-dilaton-Gauss-Bonnet theory). I w
ill explain how a new class of “modified harmonic” gauges and gauge-fi
xing procedures can be used to write the equations of motion of this theor
y in a form that\, at weak coupling\, admits a well-posed initial value pr
oblem. I will conclude by discussing possible applications to numerical re
lativity.\n\nIf you have a question about this talk\, please contact Dejan Gajic.\n
LOCATION:https://stable.researchseminars.org/talk/CambridgeFriGR/2/
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SUMMARY:An Chen (University College London)
DTSTART:20200515T120000Z
DTEND:20200515T130000Z
DTSTAMP:20260404T095848Z
UID:CambridgeFriGR/3
DESCRIPTION:Title: Distinguishing high-mass binary neutron stars from binary bl
ack holes with gravitational waves\nby An Chen (University College Lon
don) as part of DAMTP Friday GR seminar\n\n\nAbstract\nThe current gravita
tional-wave (GW) observatories have detected tens of binary black hole (BB
H) and several binary neutron star (BNS) merger events in the past few yea
rs. While the GW signal of the first BNS merger GW170817 was accompanied b
y a variety of electromagnetic (EM) counterparts\, sufficiently high-mass
BNS mergers are expected to be unable to power bright EM counterparts. The
putative high-mass BNS merger GW190425 \, for which no confirmed EM count
erpart has been identified\, may be an example of such a system. In additi
on\, primordial black holes may have the same masses as neutron stars. Hen
ce it is important to understand how well we will be able to distinguish h
igh-mass BNSs and low-mass BBHs solely from their GW signals. To do this\,
we consider the imprint of the tidal deformability of the neutron stars o
n the GW signal. We simulate a set of BNS signals with different total mas
ses and equations of state\, as well as the analogous BBH signals. We perf
orm Bayesian parameter estimation on these signals in three kinds of curre
nt and future GW observatory networks. Our analysis suggests that we canno
t distinguish high-mass BNSs from BBHs with the current O3 network at a hi
gh credible level\, but we can distinguish them at a high credible level u
sing the O4 network\, and even higher for the third-generation network.\n\
nIf you have a question about this talk\, please contact Nathan Johnson-McDaniel.\n
LOCATION:https://stable.researchseminars.org/talk/CambridgeFriGR/3/
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SUMMARY:Elena Giorgi (Princeton University)
DTSTART:20200529T120000Z
DTEND:20200529T130000Z
DTSTAMP:20260404T095848Z
UID:CambridgeFriGR/4
DESCRIPTION:by Elena Giorgi (Princeton University) as part of DAMTP Friday
GR seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CambridgeFriGR/4/
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SUMMARY:Scott Melville (University of Cambridge)
DTSTART:20200605T120000Z
DTEND:20200605T130000Z
DTSTAMP:20260404T095848Z
UID:CambridgeFriGR/5
DESCRIPTION:by Scott Melville (University of Cambridge) as part of DAMTP F
riday GR seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CambridgeFriGR/5/
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SUMMARY:Yakov Shlapentokh-Rothman (Princeton University)
DTSTART:20200612T120000Z
DTEND:20200612T130000Z
DTSTAMP:20260404T095848Z
UID:CambridgeFriGR/6
DESCRIPTION:by Yakov Shlapentokh-Rothman (Princeton University) as part of
DAMTP Friday GR seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/CambridgeFriGR/6/
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