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Why is the Universe Accelerating?

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arxiv astro-ph/0310342 v2 pith:EFN2JMFW submitted 2003-10-13 astro-ph gr-qchep-phhep-th

classification astro-phgr-qchep-phhep-th
keywords acceleratingenergyissuessmallsomeuniversevacuumappears
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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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Cited by 1 Pith paper

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