Bulletin of the American Physical Society
APS April Meeting 2013
Volume 58, Number 4
Saturday–Tuesday, April 13–16, 2013; Denver, Colorado
Session X2: Invited Session: Non-WIMP Dark Matter |
Hide Abstracts |
Sponsoring Units: DPF Chair: Bob Bernstein, Fermi National Accelerator Laboratory Room: Plaza D |
Tuesday, April 16, 2013 10:45AM - 11:21AM |
X2.00001: Non-WIMP dark matter in cosmology Invited Speaker: Annika Peter The nature of dark matter is one of the major ``known unknowns'' of the physics of the Universe. There exists a zoo of hypothesized dark-matter candidates, each of which has a set of properties that determine the prospects for detecting and identifying it. The physical properties of these dark-matter candidates may leave unique signatures in formation and evolution of dark-matter halos and galaxies. In this talk, I will show how to classify dark-matter candidates in by cosmologically relevant phenomenological parameters. I demonstrate how dark-matter physics affects the growth of structure in the Universe, and what kinds of astronomical observations may be employed to constrain the particle properties of dark matter. [Preview Abstract] |
Tuesday, April 16, 2013 11:21AM - 11:57AM |
X2.00002: Axion and Axion-Like Particle Dark Matter Invited Speaker: Leslie Rosenberg One very compelling dark matter candidate is the ALP, or axion-like particle. These particles generically are expected to have extraordinarily feeble interactions with normal matter and radiation, have very low masses and long lifetimes, and would be produced non-thermally in the early universe. Like their WIMP dark-matter counterparts, they arose as a solution to problems in the Standard Model, and their properties make them ideal dark-matter candidates. Large and ultra-sensitive experiments are now being deployed which are finally able to detect these particles or rule them out at high confidence. This talk will review this attractive dark-matter candidate and the status of the various searches. [Preview Abstract] |
Tuesday, April 16, 2013 11:57AM - 12:33PM |
X2.00003: The Experimental Search for Hidden Sector Photons Invited Speaker: John Jaros Are there more photon-like particles, and consequently additional forces, in Nature? Such particles would be U(1) vector gauge bosons, couple to some analogue of electric charge, and could be massive or massless. Recent experimental surprises in the cosmic rays, possible direct sightings of Dark Matter, and the discrepancy between the experimental and theoretical values of the muon's anomalous magnetic moment have all prompted explanations involving hidden sector photons, often with masses below 1 GeV. Holdum recognized in the `80's that if such particles exist, they would ``kinetically mix'' with the standard model photon, giving them an effective coupling to electric charge, albeit with strengths 1/1000$^{\mathrm{th}}$ or less compared to the normal electromagnetic coupling. So hidden sector photons aren't perfectly hidden. Since they couple to electrons, hidden sector photons could be radiated in a bremsstrahlung-like process, and, if they were heavy enough, hidden sector photons could decay to electron-positron pairs. Both their production and decay would however be highly suppressed compared to processes governed by normal electromagnetic interactions, so they may well be hidden under huge Standard Model backgrounds. This talk will discuss the physics of and motivations for hidden sector photons, and review the status and prospects of searches for them at electron and hadron collider experiments, fixed target electron beam experiments, beam dump experiments, and laser experiments. The chance to find a new force particle, at a readily accessible mass, perfectly motivates this new territory on the Intensity Frontier. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700