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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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