Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session U02: Gravitational Waves and Dark Matter SearchesInvited Session
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Sponsoring Units: DGRAV DPF Chair: Daniel Holz, University of Chicago Room: A112-113 |
Monday, April 16, 2018 3:30PM - 4:06PM |
U02.00001: Ultra-light axion dark matter Invited Speaker: Lam Hui We will discuss the possibility that dark matter is comprised of an ultra-light axion-like particle, whose de Broglie wavelength is astronomical. [Preview Abstract] |
Monday, April 16, 2018 4:06PM - 4:42PM |
U02.00002: Searching for Ultralight Particles with Black Holes and Gravitational Waves Invited Speaker: Masha Baryakhtar The LIGO detection of gravitational waves has opened a new window on the universe. I will discuss how the process of superradiance, combined with gravitational wave measurements, makes black holes into nature's laboratories to search for new light bosons, from axions to dark photons. When a bosonic particle's Compton wavelength is comparable to the horizon size of a black hole, superradiance of these bosons into `hydrogenic' bound states extracts energy and angular momentum from the black hole. The occupation number of the levels grows exponentially and the black hole spins down. One candidate for such an ultralight boson is the QCD axion with decay constant above the GUT scale. Current black hole spin measurements disfavor a factor of 30 (400) in axion (vector) mass; future measurements can provide evidence of a new boson. Particles transitioning between levels and annihilating to gravitons may produce thousands of monochromatic gravitational wave signals, and turn LIGO into a particle detector. [Preview Abstract] |
Monday, April 16, 2018 4:42PM - 5:18PM |
U02.00003: Primordial Black Holes as Gravitational Wave Sources Invited Speaker: Ilias Cholis With the first detections of gravitational waves by LIGO, a new window has opened to study the cosmos. Of the many questions we can ask, I am going to focus on the one pertaining to the nature of dark matter. I am going to show that if dark matter is composed of primordial black holes produced at the early stages of the Universe, with a characteristic mass range of 10-100 solar masses; then the LIGO interferometers can be used to indirectly detect dark matter in the local Universe. Furthermore I am going to discus probes to use and the possible signals to search for in order to achieve that goal. [Preview Abstract] |
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