Speaker
Description
Unimodular quantum cosmology results in a Schrödinger-like equation that governs the dynamics of the wave function of the universe.
The explicit time dependence makes it possible to compare directly and independently the dynamics of the expectation values of the scale factor, the Hubble parameter and the matter density with their classical counterparts. We construct wave packet solutions for the extremal cases of stiff matter and an empty universe (de Sitter). We then calculate the expectation values of the relevant cosmological observables and discuss the influence of quantum uncertainties on the resulting quantum deviations. Finally we show how quantum deviations can be calculated by a moment expansion approach for general perfect fluid models where the wave packet solutions are not explicitly known.