Vacuum Energy: If Not Now, Then When?
Sidney A. Bludman
Abstract
We review the cosmological evidence for a low matter density universe and a cosmological constant or dynamical vacuum energy and address the cosmolog$ coincidence problem: why is the matter density about one-half the vacuum energy now. This is reasonble, following the anthropic argument of Efstathiou and of Martel, Schapiro & Weinberg.
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