Semiclassical solutions of generalized Wheeler-DeWitt cosmology

Understand

We consider an extension of WDW minisuperpace cosmology with additional interaction terms that preserve the linear structure of the theory.

• General perturbative methods are developed and applied to known semiclassical solutions for a closed Universe filled with a massless scalar.
• The exact Feynman propagator of the free theory is derived by means of a conformal transformation in minisuperspace.
• As an example, a stochastic interaction term is considered and first order perturbative corrections are computed.