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Paper: Why is the Universe Accelerating?
Volume: 339, Observing Dark Energy
Page: 4
Authors: Carroll, S.M.
Abstract: The Universe appears to be accelerating, but the reason 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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