Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Q02: Space Based Gravitational-wave AstronomyInvited
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Sponsoring Units: DGRAV Chair: Geoffrey Lovelace, Cal State Fullerton Room: Sheraton Plaza D |
Monday, April 15, 2019 10:45AM - 11:21AM |
Q02.00001: Low-frequency gravitational waves from massive black holes: implications for fundamental physics and astrophysics Invited Speaker: Emanuele Berti The observation of compact binary mergers by the LIGO/Virgo collaboration marked the dawn of a new era in astronomy. LISA will fulfill this vision by opening a new observational window at low frequencies. The gravitational radiation emitted by compact binaries in the LISA band encodes important information on their astrophysical formation mechanism. Furthermore, compact objects - whether in isolation or in binaries - are excellent astrophysical laboratories to probe our understanding of high-energy physics and strong-field gravity. I will discuss how LISA can further our understanding of the formation and evolution of compact binaries, test gravity in the strong field regime, and look for smoking guns of new physics. |
Monday, April 15, 2019 11:21AM - 11:57AM |
Q02.00002: The NANOGrav 12.5-year Dataset: Providing Insights into Galaxy Growth through Cosmic Time Invited Speaker: Maura McLaughlin The NANOGrav collaboration monitors an array of over 70 precisely timed millisecond pulsars with the Green Bank Telescope and Arecibo Observatory in order to detect perturbations due to gravitational waves at nanohertz frequencies. These gravitational waves will most likely result from an ensemble of supermassive black hole binaries. I will present the most recent upper limits on various types of gravitational wave sources and will demonstrate that these limits are already constraining models for galaxy formation and evolution. I will then describe the dramatic gains in sensitivity that are expected from discoveries of millisecond pulsars, more sensitive instrumentation, improved detection algorithms, and international collaboration and show that detection is possible before the end of the decade. |
Monday, April 15, 2019 11:57AM - 12:33PM |
Q02.00003: Galactic LISA sources and their potential for multi-messenger and multi-wavelength studies Invited Speaker: Thomas Kupfer The Laser Interferometer Space Antenna (LISA) is a space-based gravitational wave (GW) detector sensitive at lower frequencies than LIGO. The dominant Galactic sources in the LISA band will be binary stars with orbital periods <60min, so called ultracompact binaries (UCB). They are a rare and exotic class of binary stars with orbital periods as short as a few minutes and physical separations between components of the order of the Earth-Moon distance. Theoretical studies predict that LISA will detect a few thousand Galactic binaries after one year of operations which are also bright in the electromagnetic wavebands. This will allow us to perform combined GW and electromagnetic multi-messenger studies ona statistical sample of UCBs and derive population properties of these systems with unprecedented quality. Currently, only about a dozen of these LISA guaranteed sources have been studied in the electromagnetic wavebands. In this talk I will give an overview of the known population of LISA guaranteed sources and outline some opportunities for upcoming multi-messenger observations. I will also discuss the potential of LISA detections of stellar-mass binary black holes about one year prior to their merger where the coalescence can be detected with LIGO. These pre-merger detections in the LISA frequency band open-up unique opportunities such pre-pointing of telescopes to perform coincident GW and multi-wavelength electromagnetic observations of binary black hole coalescences. |
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