Vacuum fluctuations of the supersymmetric field in curved background

Understand

We study a supersymmetric model in curved background spacetime.

• We calculate the effective action and the vacuum expectation value of the energy momentum tensor using a covariant regularization procedure.
• A soft supersymmetry breaking induces a nonzero contribution to the vacuum energy density and pressure.
• Assuming the presence of a cosmic fluid in addition to the vacuum fluctuations of the supersymmetric field an effective equation of state is derived in a self-consistent approach at one loop order.