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hep-th2025
Time as a test-field: the no-boundary universe in motion and a smooth radiation bounce
Federico Piazza, Siméon Vareilles
The proper time of an observer can be introduced as a degree of freedom in quantum cosmology, additional to the existing fields. We review two arguments for using the Schrödinger e…
hep-th2025
Modified Microcausality from Perturbation Theory
Giordano Cintia, Federico Piazza, Samuel Ramos
Relativistic microcausality is the statement that local field operators commute outside the light-cone. This condition is known to break down in low-energy effective theories, such…
hep-th2025
Cosmological perturbations meet Wheeler DeWitt
Federico Piazza, Siméon Vareilles
We study approximate solutions of the Wheeler DeWitt (WdW) equation and compare them with the standard results of cosmological perturbation theory. In mini-superspace, we introduce…