Bulletin of the American Physical Society
2006 Four Corners Section of the APS Fall Meeting
Friday–Saturday, October 6–7, 2006; Logan, Utah
Session I1: The Final Frontier? |
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Chair: Keith Dienes, University of Arizona Room: Eccles Conference Center Room 216 |
Saturday, October 7, 2006 10:45AM - 11:21AM |
I1.00001: What's New in Gravitational Physics Invited Speaker: For nearly a century Einstein's General Theory of Relativity has provided our best theory of space, time, and the gravitational interaction. In 2006, research in gravitational physics is, in many ways, at an unprecedented level of activity. In this talk I will give a superficial survey of some of the current hot topics in gravitational physics research. I will emphasize: current and future gravitational wave searches, the 2-body problem in general relativity, and approaches to constructing a quantum theory of gravity. [Preview Abstract] |
Saturday, October 7, 2006 11:21AM - 11:57AM |
I1.00002: Gravitational Holography Invited Speaker: The asymptotic number of states in an appropriately defined region in any theory of quantum gravity which reduces to Einstein gravity at large distances is equal to one quarter of the area in Planck units. A non-redundant description therefore requires only a hologram at the boundary of the region. The holographic properties of the states in quantum gravity lead to a mixing of the usual concepts of ultraviolet and infrared. This mixing is at odds with various properties of local quantum field theory such as the Heisenberg uncertainty relation as well as the upper bound on the fixed angle inclusive cross section in very high energy collisions. The holographic properties of gravity also imply that quantum contributions to the vacuum energy are finite and parametrically at most of order the classical value from which the infrared curvature scale is determined. Gravitational holography therefore provides a technically natural solution to the cosmological constant problem which plaques any local quantum field theory description of gravity. [Preview Abstract] |
Saturday, October 7, 2006 11:57AM - 12:33PM |
I1.00003: Quantum Universe Invited Speaker: What is the Universe made of? How did it come to be? Why do we exist? This kind of fundamental questions about the Universe used to be just philosophy, but are now coming into the realm of quantitative science. The key is in quantum physics of elementary particles that determined the evolution of the Universe when it was very young. I will discuss this amazing connection between the large (the Universe) and the tiny (elementary particles), in the context of current and forthcoming experiments. [Preview Abstract] |
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