Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1997-04-17
Phys.Rev. D57 (1998) 3302-3316
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
New references and one appendix added, misprints corrected. To be published in Phys. Rev. D. 29 pages, ReVTeX
Scientific paper
10.1103/PhysRevD.57.3302
We study the influence of the reheating and equality transitions on superhorizon density perturbations and gravitational waves. Recent criticisms of the `standard result' for large-scale perturbations in inflationary cosmology are rectified. The claim that the `conservation law' for the amplitude of superhorizon modes was empty is shown to be wrong. For sharp transitions, i.e. the pressure jumps, we rederive the Deruelle-Mukhanov junction conditions. For a smooth transition we correct a result obtained by Grishchuk recently. We show that the junction conditions are not crucial, because the pressure is continuous during the reheating transition. The problem occurred, because the perturbed metric was not evolved correctly through the smooth reheating transition. Finally, we derive the `standard result' within Grishchuks's smooth (reheating) transition.
Martin Jerome
Schwarz Dominik J.
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