On the mystery of the cosmic vacuum energy density

Details On the mystery of the cosmic vacuum energy density On the mystery of the cosmic vacuum energy density

2000-09-25

arxiv.org/abs/astro-ph/0009386v1

Astronomy and Astrophysics

Astrophysics

15 pages with one figure, uses special proceedings style. Invited talk at the third international conference on Dark Matter in

Scientific paper

After a short history of the $\Lambda$-term it is explained why the (effective) cosmological constant is expected to obtain contributions from short-distance physics, corresponding to an energy at least as large as the Fermi scale. The actual tiny value of the cosmological constant by particle physics standards represents, therefore, one of the deepest mysteries of present-day fundamental physics. Recent proposals of an approach to the cosmological constant problem which make use of (large) extra dimensions are briefly discussed. Cosmological models with a dynamical $\Lambda$, which attempt to avoid the disturbing cosmic coincidence problem, are also reviewed.

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