Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 58, Number 12
Friday–Saturday, October 18–19, 2013; Denver, Colorado
Session K1: Astrophysics III: Dark Matter |
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Chair: Robert Stencel, University of Denver Room: 254 |
Saturday, October 19, 2013 11:15AM - 11:39AM |
K1.00001: The Status of Supersymmetric Dark Matter Invited Speaker: Pearl Sandick One of the most exciting outstanding puzzles in modern physics is an explanation for the $\sim$85{\%} of the matter density of the Universe that we attribute to ``dark matter.'' Supersymmetry, a compelling theory of physics beyond the Standard Model, may hold the answer. In this talk, I'll discuss the implications of results from the LHC and from dark matter searches for minimal supersymmetric models. [Preview Abstract] |
Saturday, October 19, 2013 11:39AM - 12:03PM |
K1.00002: Directional dark matter detection and the DRIFT experiment Invited Speaker: John Harton Evidence for a form of matter unlike normal atoms and molecules has become very compelling in the decades since the early 1930's when it was discovered that the gravitational mass in a cluster of galaxies far exceeded the mass of the visible matter in that cluster and that the orbital velocity of stars in the Milky Way could not be accounted for by the visible matter alone. The search for the nature of this ``dark matter'' is one of the most compelling mysteries in science today with experiments worldwide. A leading candidate for the dark matter is the WIMP or Weakly Interacting Massive Particle, which is posited to have a mass in the GeV/c$^{2}$ range and to interact with normal matter with a cross section on the weak scale. Experimental evidence points to galaxies being surrounded by a halo of dark matter, and that halo may be a cloud of WIMPs. In the overall standard model of WIMP dark matter the halo does not rotate with the stars in a galaxy, and collisions of WIMPs with normal matter would result in recoil nuclei with energies of a few keV to perhaps few hundred keV. This talk will focus on the subset of experiments called directional dark matter detectors; these experiments aim to exploit a daily modulation in the dark matter signal by measuring the direction of travel of the recoiling nucleus. The DRIFT dark matter collaboration is one such directional experiment, and the group is running a detector called DRIFT-IId in the Boulby mine in the UK. [Preview Abstract] |
Saturday, October 19, 2013 12:03PM - 12:15PM |
K1.00003: Chaos in the general relativistic three-body problem Taylor Morgan, Jared Jay, David Neilsen The three-body problem in classical gravity is known to have chaotic solutions. We are investigating chaos in the three-body problem in general relativity using post Newtonian equations. We model a binary system that interacts with an incoming star. We present results of these interactions that display features of chaos, such as sensitivity to initial conditions and scale invariance. [Preview Abstract] |
Saturday, October 19, 2013 12:15PM - 12:27PM |
K1.00004: Charged Particle Spectrometer for LNAR Tyler Westover, John Ellsworth At BYU we are developing charged particle and neutron spectrometers. We wish to study two things: One low energy fusion reactions that compete with background and two the behavior of neutrons emitted from fission reactions. Reported here is work done to update our charged particle spectrometer using a high speed digitizer. [Preview Abstract] |
Saturday, October 19, 2013 12:27PM - 12:39PM |
K1.00005: Chaotic Scattering in the Post-Newtonian Three-body Problem Jared Jay, David Neilsen A general solution for the three-body problem in Newtonian gravity does not exist, and the system is known to be chaotic. We consider the three-body problem in general relativity using the Post-Newtonian equations of motion that include the first gravitational-wave emission terms. Using a model problem of a binary that interacts with a third object, we present evidence that this system also has chaotic solutions. [Preview Abstract] |
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