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Scientific article
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English

New contribution to cosmological perturbations of some inflationary models

Contributors

Durrer, Ruth; Sakellariadou, Mairi

Published in

Physical review. D. Particles and fields, vol. 50, no. 10, p. 6115-6122

Publication date

1994

Abstract

We show that there are inflationary models for which perturbations in the energy momentum tensor, which are of second order in the scalar field, cannot be neglected. We first specify the conditions under which the usual first order perturbations are absent. We then analyze classically, the growth and decay of our new type of perturbations for one mode of fluctuations \de\phi k in the scalar field. We generalize this analysis, considering the contribution from the whole spectrum of \de\phi to a given wavelength of geometrical perturbations. Finally, we discuss the evolution of the perturbations during the subsequent radiation dominated era and discuss the resulting spectrum of density fluctuations. In the case of a massless scalar field we find a spectral index n=4. For massive scalar fields we obtain n=0 but the resulting amplitude of fluctuations for inflation around a GUT scale are by far too high. Hence, "conventional" inflationary models must not be influenced by this new type of perturbations, in order to lead to acceptable matter and CMB fluctuations.

UNIGE affiliation entities

Not a UNIGE publication

Citation (ISO format)

DURRER, Ruth, SAKELLARIADOU, Mairi. New contribution to cosmological perturbations of some inflationary models. In: Physical review. D. Particles and fields, 1994, vol. 50, n° 10, p. 6115–6122. doi: 10.1103/PhysRevD.50.6115

Main files (1)

Article (Accepted version)

Identifiers

Journal ISSN

0556-2821
616views
354downloads

Technical informations

Creation

26/02/2009 17:00:00

First validation

26/02/2009 17:00:00

Update

14/03/2023 15:01:21

Status update

14/03/2023 15:01:21

Last indexation

29/10/2024 11:14:12
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