Vacuum fluctuations in a supersymmetric model in FRW spacetime
arXiv:1104.1349 · doi:10.1103/PhysRevD.83.105003
Abstract
We study a noninteracting supersymmetric model in an expanding FRW spacetime. A soft supersymmetry breaking induces a nonzero contribution to the vacuum energy density. A short distance cutoff of the order of Planck length provides a scale for the vacuum energy density comparable with the observed cosmological constant. Assuming the presence of a dark energy substance in addition to the vacuum fluctuations of the field an effective equation of state is derived in a selfconsistent approach. The effective equation of state is sensitive to the choice of the cut-off but no fine tuning is needed.
19 pages, accepted for publication in Phys. Rev. D
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