Issues on the cosmological constant

Jun'ichi Yokoyama

Issues on the cosmological constant

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arxiv gr-qc/0305068 v1 pith:6Z3XIENQ submitted 2003-05-19 gr-qc

Jun'ichi Yokoyama This is my paper

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keywords constantcosmologicaldarkenergyissuesperturbativeamplitudebriefly

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abstract

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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