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Quantization of perturbations during inflation in the 1+3 covariant formalism
Cyril Pitrou, Jean-Philippe Uzan
This note derives the analogue of the Mukhanov-Sasaki variables both for scalar and tensor perturbations in the 1+3 covariant formalism. The possibility of generalizing them to non…
New Developments in the Search for the Topology of the Universe
Jean-Philippe Uzan, Roland Lehoucq, Jean-Pierre Luminet
Multi-connected Universe models with space idenfication scales smaller than the size of the observable universe produce topological images in the catalogs of cosmic sources. In thi…
Conservation Laws for Cosmological Perurbations
Nathalie Deruelle, Jean-Philippe Uzan
We briefly recall the problem of defining conserved quantities such as energy in general relativity, and the solution by introducing a symmetric background. We apply the general fo…