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Evolution of non-linear cosmological perturbations

Abstract : We define fully non-perturbative generalizations of the uniform density and comoving curvature perturbations, which are known, in the linear theory, to be conserved on sufficiently large scales for adiabatic perturbations. Our non-linear generalizations are defined geometrically, independently of any coordinate system. We give the equations governing their evolution on all scales. Also, in order to make contact with previous works on first and second order perturbations, we introduce a coordinate system and show that previous results can be recovered, on large scales, in a remarkably simple way, after restricting our definitions to first and second orders in a perturbative expansion.
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Contributor : Simone Lantz <>
Submitted on : Tuesday, November 22, 2005 - 2:05:04 PM
Last modification on : Monday, December 14, 2020 - 9:53:45 AM

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David Langlois, F. Vernizzi. Evolution of non-linear cosmological perturbations. Physical Review Letters, American Physical Society, 2005, 95, pp.091303. ⟨10.1103/PhysRevLett.95.091303⟩. ⟨in2p3-00025106⟩



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