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 U02: The Milky Way as a Window to Dark MatterInvited
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Sponsoring Units: DAP Chair: Belinda Wilkes, University of Bristol Room: MG Salon A - 3rd Floor |
Tuesday, April 18, 2023 1:30PM - 2:06PM |
U02.00001: George E. Valley Jr. Prize: Shining Light on Dark Matter Invited Speaker: Lina Necib In this talk, I discuss how stellar kinematics can be used as tracers for Dark Matter in the Milky Way, particularly in the solar neighborhood, the Galactic center, and dwarf galaxies. I will emphasize the role of machine learning techniques in uncovering the physics behind the tremendous new data in high resolution simulations and observations from Gaia. I will discuss the local kinematic stellar structures found in the solar neighborhood, the updated measurement of the circular velocity of the Milky Way using data driven models, and a novel Graph Neural Network-based method for the extraction of the density profile of Dark Matter in dwarf galaxies. I will close by discussing how these measurements can be a window in the particle nature of Dark Matter. |
Tuesday, April 18, 2023 2:06PM - 2:42PM |
U02.00002: The mass-loss history of the Sagittarius dwarf galaxy Invited Speaker: Ana Bonaca Accretion of a dark-matter subhalo is the key process in growth of galaxies and dark-matter halos, however, orbital decay of any merger has not yet been reconstructed. In this talk I will present evidence for a spectrum of orbital resonances in a sample of nearly 20,000 Milky Way stars beyond the disk plane as nearly equidistant peaks in orbital energies, and show that the accretion of a Sagittarius-like dwarf galaxy forms such ripples. Idealized numerical experiments show that the ripple strength is set by the mass of the merger, while their positions depend on its orbital history. Matching the narrow energy spacing between the ripples requires including the effects of dynamical friction and mass loss. As the mass-loss rates of dark-matter halos depend sensitively on their density profile, the detected ripples could provide a unique constraint on the particle nature of dark matter. |
Tuesday, April 18, 2023 2:42PM - 3:18PM |
U02.00003: Dark matter physics from near-field cosmology Invited Speaker: Vera Gluscevic Cosmological observables, from the CMB anisotropy to the census of galaxies in the local universe, offer the most direct and broad tests for the nature of dark matter, including a number of scenarios that are challenging or even impossible to test in a laboratory setting. I will review the status of the recent early-universe and late-universe searches for the identity of dark matter, summarizing the best current limits on scattering between dark matter and baryons, the non-thermal production mechanisms for sterile neutrinos, and mass bounds on thermal-relic dark matter. I will highlight the interplay between complementary probes of dark matter physics, focusing especially on the substructure in the Milky Way and its potential to resolve cosmological tensions. Finally, I will discuss the prospects for unveiling the physics of dark matter in the coming decade. |
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