Why is the Universe Accelerating?

Details Why is the Universe Accelerating? Why is the Universe Accelerating?

2003-10-13

arxiv.org/abs/astro-ph/0310342v2

ECONF C0307282:TTH09,2003; AIP Conf.Proc.743:16-32,2005

Astronomy and Astrophysics

Astrophysics

22 pages; Contribution to Measuring and Modeling the Universe, Carnegie Observatories Astrophysics Series Vol. 2, ed. W. L. Fr

Scientific paper

10.1063/1.1848314

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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