Issues on the cosmological constant

Details Issues on the cosmological constant Issues on the cosmological constant

2003-05-19

arxiv.org/abs/gr-qc/0305068v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Proc. JGRG12 (12th workshop on general relativity and gravitation in Japan)

Scientific paper

Some issues of the cosmological constant or dark energy are briefly reviewed. There are an increasing number of observations that constrain the equation of state of dark energy more stringently and favor the time-independent cosmological constant. Then a plausible model of dark energy would be a theory with degenerate perturbative vacua in which its origin is explained by a nonperturbative effect so that, unlike quintessence, k-essence etc., it is separable from the perturbative problem why its amplitude is smaller than the Planckian density by a factor of $\order (10^{-120})$.

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