Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session Y4: Gravity and Cosmology |
Hide Abstracts |
Sponsoring Units: DPF Chair: Natalie Roe, Lawrence Berkeley National Laboratory Room: Hyatt Regency Jacksonville Riverfront Grand 3 |
Tuesday, April 17, 2007 1:30PM - 2:06PM |
Y4.00001: Experimental Results on Gravity at Short Distances Invited Speaker: A number of today's most fundamental physical mysteries have gravity at their core. Why is dark energy, known to us through its repulsive gravitational effect, so small or non-zero? Why is gravity's energy scale so drastically different from that of the other fundamental forces? Are there hidden extra dimensions? Small-scale precision gravity experiments are an elegant means of searching for clues about and answers to these questions. I present results from the E\"ot-Wash group at the University of Washington. We conducted three torsion-balance experiments to test the gravitational inverse-square law from separations of 9.53mm down to 55$\mu$m. Our results constrain new gravity-strength yukawa-type interactions to have a length scale $\lambda\le56\mu$m at 95\% confidence. [Preview Abstract] |
Tuesday, April 17, 2007 2:06PM - 2:42PM |
Y4.00002: Gravitation and Extra Dimensions Invited Speaker: We review some recent ideas on gravitational aspects of models with extra dimensions. Models of braneworld gravity have received a great deal of attention recently and they range from warped extra dimensions with implications at colliders to infinite extra dimensions and their implications in cosmology and astrophysics. We will pay particular attention to models of induced gravity (the so called DGP models), their successes in explaining the current acceleration of the Universe and their shortcomings and discuss simple generalizations that might evade some of these difficulties. [Preview Abstract] |
Tuesday, April 17, 2007 2:42PM - 3:18PM |
Y4.00003: Accelerating Universe, Dark Energy and Modified Gravity Invited Speaker: One of the great mysteries of modern cosmology is the origin and nature of dark energy - a smooth component that contributes about 70\% of the total energy density in the universe and causes its accelerated expansion. While measurements of expansion history of the universe are steadily improving thanks to a variety of cosmological measurements, theoretical understanding of what powers the accelerating universe is very poor. In this talk I review some recent attempts to explain the source of the accelerating universe, and examine critically the prospects to distinguish between modifications of general relativity and dark energy explanations for the present-day accelerated expansion. [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