Super-horizon perturbations and preheating

Details Super-horizon perturbations and preheating Super-horizon perturbations and preheating

2000-10-31

arxiv.org/abs/astro-ph/0010639v1

Astronomy and Astrophysics

Astrophysics

4 pages, talk presented at "Cosmology and Particle Physics 2000", Verbier (Switzerland), 17-28 July 2000

Scientific paper

10.1063/1.1363528

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 constant when the non-adiabatic pressure perturbation is negligible. We clarify the conditions under which super-horizon curvature perturbations may vary, using preheating as an example.

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