Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session M04: LIGO: Ground-based Interferometers: Observations and ResultsInvited
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Sponsoring Units: DGRAV Chair: Erik Katsavounidis, MIT Room: MG Salon C - 3rd Floor |
Monday, April 17, 2023 10:45AM - 11:21AM |
M04.00001: Status of the LIGO, Virgo, and KAGRA gravitational-wave detectors Invited Speaker: Georgia Mansell The advanced LIGO (Laser Interferometer Gravitational-wave Observatory) detectors are undergoing preparations for the fourth observing run (O4). aLIGO has an ambitious target sensitivity range for O4: 165-190 Mpc for binary neutron star inspirals, an increase from ~120 Mpc in the previous observing run. In this talk I will present the latest status of the aLIGO, adVirgo and KAGRA instruments in the lead up to O4. Focusing on the LIGO detectors, I will cover recent hardware upgrades to the interferometers, including a filter cavity for squeezed light rotation, active mode matching optics, laser amplifier improvements, and test mass replacements. I will discuss commissioning activities and provide a breakdown of the current noise limitations. |
Monday, April 17, 2023 11:21AM - 11:57AM |
M04.00002: Observations of gravitational waves from coalescing binaries: Discoveries from ground-based detectors Invited Speaker: Christopher P Berry The LIGO Scientific, Virgo and KAGRA Collaboration have completed analysis of data from the first three observing runs of the advanced detector network. The increasing sensitivity of the detector network has resulted in an ever-increasing rate of candidate identification. We will summarise the discoveries from the most recent third observing run. We have found binary black holes spanning the stellar-mass range into the intermediate-mass range; we have also identified the first black hole-neutron star binaries. The binary components have a range of spins, some showing evidence of misalignment. Using the observed catalogue, we can constrain the underlying astrophysical population of gravitational-wave sources |
Monday, April 17, 2023 11:57AM - 12:33PM |
M04.00003: Detecting a stochastic gravitational-wave background with LIGO-Virgo-Kagra Invited Speaker: Arianna Renzini In under 10 years since the first direct observation of a gravitational wave (GW), GW Astronomy has made giant leaps, going from detecting loud binary black hole (BBH) coalescences, to binary neutron star (BNS) and black hole -- neutron star (BHNS) binary events, all the way to large-volume population analyses. Yet the vast majority of events are too faint to be directly detected with coherent, so-called matched filter searches, and what’s more, there are a slew of other potential sources of GWs that have yet to be identified. The collection of all GWs that may not be directly resolved by our detectors build up incoherently, giving rise to a cumulative signal we refer to as the gravitational-wave background (GWB). Given its incoherent and indeterminate nature, the GWB is best described by stochastic variables, and searched for via stochastic analyses. Different sources of GWs will contribute to the GWB differenly, hence stochastic analyses may be tailored to search for specific trademarks such as frequency dependence or directional dependence to perform component separation and give optimal results. As most GWB sources targeted by stochastic analyses are persistent, some of them may also be detected with continuous wave search methods, which are consistently more sensitive to the signal, but require more accurate source modelling. It is important to note that, until now, no source of GWs has been confidently identified using a stochastic search. |
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