Cosmological Constant as a Free Thermodynamical Variable
arXiv:1301.0009 · doi:10.1103/PhysRevD.87.104040
Abstract
We consider a possibility that the cosmological constant may not be a constant, but a free thermodynamical variable. To this end we construct a microscopic model of a spacelike two-sphere just inside of the cosmological horizon of the de Sitter spacetime. In our model the spacelike two-sphere in question is assumed to consist of discrete constituents, each of them contributing to the two-sphere an area, which is in an integer times a constant. Using our model we obtain a thermodynamical equation of state for the cosmological constant. Our equation of state implies that the cosmological constant has a certain positive lower bound, which depends on the number of the constituents of the two-sphere.
The version accepted for publication in the Physical Review D. 14 pages, no figures, significant changes to the previous version
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