Bulletin of the American Physical Society
Mid-Atlantic Section Fall Meeting 2020
Volume 65, Number 20
Friday–Sunday, December 4–6, 2020; Virtual
Session B02: Cosmology and Dark Matter |
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Chair: David Radice, Pennsylvania State University |
Friday, December 4, 2020 2:00PM - 2:36PM |
B02.00001: The LZ Dark Matter Experiment Invited Speaker: Carmen Carmona-Benitez The identification of dark matter is presently one of the greatest challenges in science, fundamental to our understanding of the Universe. The LUX-ZEPLIN (LZ) collaboration has grown out of these two precursor experiments, with the goal of constructing a next generation dark matter detector at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, using a dual-phase time projection chamber with 7 tonnes of active liquid xenon.This experiment aims to achieve unprecedented sensitivity to weakly interacting massive particles (WIMPs) and is projected to reach a WIMP-nucleon spin-independent cross section of about $1.4\times10^{-48}$ cm$^{2}$ for a 40 GeV/c$^{2}$ WIMP mass in a 1000 live-days, pushing its sensitivity close to irreducible neutrino backgrounds. The LZ experiment is well underway, and expected to begin data taking in 2021. This talk will present an overview of the LZ detector design, projected sensitivity and the current status of the experiment. [Preview Abstract] |
Friday, December 4, 2020 2:36PM - 3:12PM |
B02.00002: Seeking the unseen: The Axion Dark Matter eXperiment (ADMX) Invited Speaker: David Tanner The nature of the dark matter in the Universe is one of the most compelling questions in all of science. Dark matter makes up roughly 85\% of the mass in the universe and we don't know what it is. It interacts extremely weakly with ordinary matter and energy making detection very challenging. The axion, a very well-motivated candidate for the dark matter, can be detected by conversion to microwave photons in a strong magnetic field; this process is the basis of many searches for axions and axion-like particles. The Axion Dark Matter eXperiment (ADMX) is conducting a search for axions within the dark-matter halo of our Galaxy. The ADMX experiment employs a large-volume superconducting magnet, a high-$Q$ tunable microwave cavity, an ultrasensitive SQUID microwave amplifier, and a high-performance dilution refrigerator to enable noise backgrounds in the mK temperature range. This ``Generation 2'' ADMX detector has reached the sensitivity to detect axions even for the most-weakly-coupled theories. The ADMX detector has completed two science runs at this design sensitivity. There were no detections and the search continues with a third science run. The resulting limits on axion mass and coupling, the prospects for the ongoing search, and the outlook for the future will be discussed. [Preview Abstract] |
Friday, December 4, 2020 3:12PM - 3:48PM |
B02.00003: Cosmological Open Quantum Systems Invited Speaker: Sarah Shandera The inflationary paradigm strongly suggests that we use a quantum open systems approach to study the evolution of the universe. I will review this argument in the context of inflation, emphasizing the features that are likely to apply to other systems involving gravity. Then, I will introduce a toy model with qubits that may help to reframe outstanding questions about cosmological evolution. [Preview Abstract] |
Friday, December 4, 2020 3:48PM - 4:00PM |
B02.00004: Determining Dark Matter Properties from Gravitational Wave Observations of Dark Matter Induced Implosions of Neutron Stars and Their Tidal Deformability. Divya Singh, Anuradha Gupta, B. Sathyaprakash, Sanjay Reddy In this work, we explore the capability of future gravitational-wave detectors like the proposed US Cosmic Explorer and the European Einstein Telescope to distinguish between populations of sub-solar mass black-holes formed through dark-matter induced implosions of neutron stars and neutron stars using tidal deformability measurements. If progenitor binaries survive long enough such that dark matter particles, with some interaction cross-section and mass, get accumulated in the core of neutron stars to form a significant mass that can accrete more particles, such neutron stars are expected to collapse and form black-holes in the mass range 1-3 solar masses. In this scenario, we expect to see three kinds of compact binary populations in this mass range - binary neutron stars, binary black-holes, or neutron star - black hole binary systems. We study the tidal deformability distributions and relative rates of these populations to constrain the properties of dark matter particles. [Preview Abstract] |
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