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Article Dans Une Revue Physical Review D Année : 2005

Conserved non-linear quantities in cosmology

F. Vernizzi
  • Fonction : Auteur

Résumé

We give a detailed and improved presentation of our recently proposed formalism for non-linear perturbations in cosmology, based on a covariant and fully non-perturbative approach. We work, in particular, with a covector combining the gradients of the energy density and of the local number of e-folds to obtain a non-linear generalization of the familiar linear uniform density perturbation. We show that this covector obeys a remarkably simple conservation equation which is exact, fully non-linear and valid at all scales. We relate explicitly our approach to the coordinate-based formalisms for linear perturbations and for second-order perturbations. We also consider other quantities, which are conserved on sufficiently large scales for adiabatic perturbations, and discuss the issue of gauge invariance.

Dates et versions

in2p3-00025104 , version 1 (22-11-2005)

Identifiants

Citer

David Langlois, F. Vernizzi. Conserved non-linear quantities in cosmology. Physical Review D, 2005, 72, pp.103501. ⟨10.1103/PhysRevD.72.103501⟩. ⟨in2p3-00025104⟩
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