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 N04: Isaacson Award SessionInvited
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Sponsoring Units: DGRAV Chair: Nicolas Yunes, University of Illinois at Urbana-Champai Room: MG Salon C - 3rd Floor |
Monday, April 17, 2023 1:30PM - 2:06PM |
N04.00001: Next-generation gravitational-wave astronomy: challenges and opportunities Invited Speaker: Emanuele Berti The observation of compact binary mergers by the LIGO/Virgo/KAGRA collaboration marks the dawn of a new era in astronomy. Next-generation ground-based detector (Cosmic Explorer and the Einstein Telescope) will allow us to peer far deeper, and LISA will expand our gravitational wave "senses" by opening a new window at low frequencies. Observations of the gravitational waves emitted by compact binary systems in these two frequency windows can lead to new astrophysical insights and new tests of strong-field gravity. I will highlight some of the new challenges and opportunities presented by next-generation detectors. If time allows it, I will discuss: (i) the challenges of parameter estimation in the presence of waveform systematics and multiple overlapping sources, (ii) improvements in tests of general relativity, and (iii) the current observational status of black hole spectroscopy. |
Monday, April 17, 2023 2:06PM - 2:42PM |
N04.00002: Supermassive Black Hole Modeling for the Low-Frequency Gravitational-Wave Era Invited Speaker: Laura Blecha Supermassive black hole (SMBH) binaries are extremely powerful sources of gravitational waves (GWs) at ~ nanoHertz to milliHertz frequencies. The detection of such GWs with pulsar timing arrays (PTAs) may be imminent, and in the coming years, the Laser Interferometer Space Antenna (LISA) could detect SMBH merger events. I will summarize recent work using cosmological hydrodynamics simulations to constrain the formation of SMBH "seeds" in the early Universe, which will be key for understanding the LISA source population. I will also describe recent progress in modeling the dynamics and fueling of SMBHs, particularly in merging galaxies. These models enable new predictions of GW and multi-messenger source populations for the dawning era of low-frequency GW astrophysics |
Monday, April 17, 2023 2:42PM - 3:18PM |
N04.00003: LISA's role in time-domain and multi-messenger astronomy Invited Speaker: Katelyn Breivik The Galactic population of double stellar remnants will be the largest source class, by number, for LISA as well as potentially the largest noise source at frequencies below 1 mHz. Double white dwarf binaries make up the vast majority of the population and are flagship multi-messenger sources, observable both with electromagnetic (EM) light and gravitational waves (GWs). Binaries containing neutron stars and black holes will also be observed both in and outside of the Galaxy. In the years preceding LISA's launch, ground-based GW detectors will discover hundreds more double-compact-object mergers, while EM surveys continue to discover binaries containing compact objects and their progenitors. These rich datasets, combined with theoretical modeling of the formation pathways which produce them, will pave the way to a fully realized time-domain and multi-messenger catalog in the 2030s. In this talk, I will give an overview of a selection of science cases that will be made possible by combining LISA's GW observations with ground-based GW detections and EM observations. |
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