The Cosmological Constant Problems (Talk given at Dark Matter 2000, February, 2000)

Details The Cosmological Constant Problems (Talk given at Dark Matter 2000, February, 2000) The Cosmological Constant Problems (Talk given at Dark Matter 2000, February, 2000)

2000-05-12

arxiv.org/abs/astro-ph/0005265v1

Astronomy and Astrophysics

Astrophysics

10 pages, Latex

Scientific paper

The old cosmological constant problem is to understand why the vacuum energy is so small; the new problem is to understand why it is comparable to the present mass density. Several approaches to these problems are reviewed. Quintessence does not help with either; anthropic considerations offer a possibility of solving both. In theories with a scalar field that takes random initial values, the anthropic principle may apply to the cosmological constant, but probably to nothing else.

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