BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Suvodip Mukherjee (University of Amsterdam) DTSTART:20200501T120000Z DTEND:20200501T130000Z DTSTAMP:20260422T212830Z UID:CambridgeFriGR/1 DESCRIPTION:Title: Multi-messenger cosmology: A new frontier\nby Suvodip Mukherjee (University of Amsterdam) as part of DAMTP Friday GR seminar\n\n\nAbstrac t\nCosmic microwave background and large scale structure observations have played a crucial role in constructing the standard model of cosmology. Di scovery of astrophysical gravitational waves has opened a new avenue to ex plore the cosmos using transients. In my talk\, I will discuss a few new f rontiers in the field of physical cosmology and fundamental physics which can be explored using gravitational waves from the ongoing LIGO -Virgo obs ervatory and with the future gravitational wave missions such as LISA \, E instein Telescope and Cosmic Explorer. I will elucidate the existence of s ynergies between the electromagnetic signals and gravitational wave signal s and its importance in understanding the standard model of cosmology.\n\n If you have a question about this talk\, please contact Chandrima Ganguly.\n LOCATION:https://researchseminars.org/talk/CambridgeFriGR/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Aron Kovacs (University of Cambridge) DTSTART:20200508T120000Z DTEND:20200508T130000Z DTSTAMP:20260422T212830Z UID:CambridgeFriGR/2 DESCRIPTION:Title: Well-posed formulation of scalar-tensor effective field theory\ nby Aron Kovacs (University of Cambridge) as part of DAMTP Friday GR semin ar\n\n\nAbstract\nEffective field theory provides a way of parameterizing strong-field deviations from General Relativity that might be observable i n the gravitational waves emitted in a black hole merger. To perform numer ical simulations of mergers in such theories it is necessary that the equa tions be written in a form that admits a well-posed initial value formulat ion. In this talk\, I will focus on gravity coupled to a scalar field incl uding the leading (4-derivative) effective field theory corrections (this theory is referred to as Einstein-dilaton-Gauss-Bonnet theory). I will exp lain how a new class of “modified harmonic” gauges and gauge-fixing pr ocedures can be used to write the equations of motion of this theory in a form that\, at weak coupling\, admits a well-posed initial value problem. I will conclude by discussing possible applications to numerical relativit y.\n\nIf you have a question about this talk\, please contact Dejan Gajic.\n LOCATION:https://researchseminars.org/talk/CambridgeFriGR/2/ END:VEVENT BEGIN:VEVENT SUMMARY:An Chen (University College London) DTSTART:20200515T120000Z DTEND:20200515T130000Z DTSTAMP:20260422T212830Z UID:CambridgeFriGR/3 DESCRIPTION:Title: Distinguishing high-mass binary neutron stars from binary black hol es with gravitational waves\nby An Chen (University College London) as part of DAMTP Friday GR seminar\n\n\nAbstract\nThe current gravitational- wave (GW) observatories have detected tens of binary black hole (BBH) and several binary neutron star (BNS) merger events in the past few years. Whi le the GW signal of the first BNS merger GW170817 was accompanied by a var iety of electromagnetic (EM) counterparts\, sufficiently high-mass BNS mer gers are expected to be unable to power bright EM counterparts. The putati ve high-mass BNS merger GW190425 \, for which no confirmed EM counterpart has been identified\, may be an example of such a system. In addition\, pr imordial black holes may have the same masses as neutron stars. Hence it i s important to understand how well we will be able to distinguish high-mas s BNSs and low-mass BBHs solely from their GW signals. To do this\, we con sider the imprint of the tidal deformability of the neutron stars on the G W signal. We simulate a set of BNS signals with different total masses and equations of state\, as well as the analogous BBH signals. We perform Bay esian parameter estimation on these signals in three kinds of current and future GW observatory networks. Our analysis suggests that we cannot disti nguish high-mass BNSs from BBHs with the current O3 network at a high cred ible level\, but we can distinguish them at a high credible level using th e 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://researchseminars.org/talk/CambridgeFriGR/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Elena Giorgi (Princeton University) DTSTART:20200529T120000Z DTEND:20200529T130000Z DTSTAMP:20260422T212830Z UID:CambridgeFriGR/4 DESCRIPTION:by Elena Giorgi (Princeton University) as part of DAMTP Friday GR seminar\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/CambridgeFriGR/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Scott Melville (University of Cambridge) DTSTART:20200605T120000Z DTEND:20200605T130000Z DTSTAMP:20260422T212830Z UID:CambridgeFriGR/5 DESCRIPTION:by Scott Melville (University of Cambridge) as part of DAMTP F riday GR seminar\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/CambridgeFriGR/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Yakov Shlapentokh-Rothman (Princeton University) DTSTART:20200612T120000Z DTEND:20200612T130000Z DTSTAMP:20260422T212830Z UID:CambridgeFriGR/6 DESCRIPTION:by Yakov Shlapentokh-Rothman (Princeton University) as part of DAMTP Friday GR seminar\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/CambridgeFriGR/6/ END:VEVENT END:VCALENDAR