Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session X03: Axion Cosmology and AstrophysicsInvited Live
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Sponsoring Units: DAP Chair: Asimina Arvanitaki, Perimeter Institute Room: Washington 2 |
Tuesday, April 21, 2020 10:45AM - 11:21AM Live |
X03.00001: Intensity Mapping: a New Tool for Dark Matter (and more) Invited Speaker: Anthony Pullen Line intensity mapping (LIM), in which line emission from unresolved galaxies is mapped onto a 3D field, has emerged as a unique probe of both the gas content and star formation history of the Universe as well as large-scale structure across cosmic time. In this talk I will discuss the science potential of LIM with a focus on dark matter (DM) science. I will begin with a brief introduction to LIM and the various emission lines that are being considered for tracers of large-scale structure. Next I will give a status update on both efforts to model and constrain line luminosities using current data and LIM surveys that will soon be operational. Finally, I will present how we hope to constrain properties of DM through LIM, particularly through searching for signatures of DM decays or annihilations in line intensity maps as well as isocurvature perturbations through 21 cm power spectra. [Preview Abstract] |
Tuesday, April 21, 2020 11:21AM - 11:57AM Live |
X03.00002: Axion Cosmology and Dark Matter Abundance Invited Speaker: Giovanni Villadoro TBD [Preview Abstract] |
Tuesday, April 21, 2020 11:57AM - 12:33PM Live |
X03.00003: Searching for Ultralight Axions with Gravitational Waves Invited Speaker: Masha Baryakhtar I will discuss how black holes can become nature's laboratories for new ultralight particles and ongoing observations of gravitational waves can inform models of particle physics. When a particle's Compton wavelength is comparable to the horizon size of a black hole, energy and angular momentum from the black hole are converted into exponentially growing clouds of bosons, creating a gravitational atom in the sky. Theories beyond the Standard Model often include new, light, feebly interacting particles -- including the QCD axion -- whose discovery requires novel observations and search strategies. I will show how previously open parameter space of axions which interact only gravitationally can be constrained by observations of rapidly spinning black holes. I will also show how such `gravitational atoms' may source up to thousands of monochromatic gravitational wave signals, with searches underway in current data, enabling LIGO to discover or exclude new particles. [Preview Abstract] |
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