Vacuum fluctuations in a supersymmetric model in FRW spacetime

Understand

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.