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Recent Paper On Why

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Posted by Richard Ruquist on October 19, 2003 09:05:18 UTC

Why is the Universe Accelerating?
Authors: Sean M. Carroll
Comments: 22 pages; Contribution to Measuring and Modeling the Universe, Carnegie Observatories Astrophysics Series Vol. 2, ed. W. L. Freedman
Report-no: NSF-KITP-03-86
The universe appears to be accelerating, but the reason why is a complete mystery. The simplest explanation, a small vacuum energy (cosmological constant), raises three difficult issues: why the vacuum energy is so small, why it is not quite zero, and why it is comparable to the matter density today. I discuss these mysteries, some of their possible resolutions, and some issues confronting future observations.
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http://arxiv.org/abs/astro-ph/0310342

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