A new approach to the evolution of cosmological perturbations on large scales

Details A new approach to the evolution of cosmological perturbations on large scales A new approach to the evolution of cosmological perturbations on large scales

2000-03-20

arxiv.org/abs/astro-ph/0003278v2

Phys.Rev. D62 (2000) 043527

Astronomy and Astrophysics

Astrophysics

8 pages, revtex, 1 figure, version to appear in Phys Rev D. Sign errors in original version corrected plus other minor additio

Scientific paper

10.1103/PhysRevD.62.043527

We discuss the evolution of linear perturbations about a Friedmann-Robertson-Walker background metric, using only the local conservation of energy-momentum. We show that on sufficiently large scales the curvature perturbation on spatial hypersurfaces of uniform-density is conserved when the non-adiabatic pressure perturbation is negligible. This is the first time that this result has been demonstrated independently of the gravitational field equations. A physical picture of long-wavelength perturbations as being composed of separate Robertson-Walker universes gives a simple understanding of the possible evolution of the curvature perturbation, in particular clarifying the conditions under which super-horizon curvature perturbations may vary.

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