Isocurvature perturbations in multiple inflationary models

Journal Article · Tue Nov 15 04:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.6123· OSTI ID:6837790

Polarski, D ^[1]; Starobinsky, A A ^[2]

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1. Laboratoire de Modeles de Physique Mathematique, EP93 CNRS, Universite de Tours, Parc de Grandmont, F-37200 Tours (France) Departement d'Astrophysique Relativiste et de Cosmologie, Observatoire de Paris-Meudon, UPR 176 CNRS, 92195 Meudon Cedex (France)
2. Yukawa Institute for Theoretical Physics, Kyoto University,Uji 611 (Japan) Landau Institute for Theoretical Physics, Kosygina St. 2, Moscow 117334 (Russian Federation)

The dynamics of long-wave isocurvature perturbations during an inflationary stage in multiple (multicomponent) inflationary models is calculated analytically for the case where scalar fields producing this stage interact among themselves through gravity only. This enables us to determine the correct amplitudes of such perturbations produced by vacuum quantum fluctuations of the scalar fields during the multiple inflationary stage. An exact matching to a post-inflationary evolution that gives the amplitude of isocurvature perturbations in the cold dark matter model with radiation is performed in the case where a massive inflaton field remains uncoupled from usual matter up to the present time. For this model, isocurvature perturbations are smaller than adiabatic ones in the region of the break in the perturbation spectrum which arises due to a transition between the two phases of inflation, but they may be much bigger and have a maximum at much shorter scales. The case of an inflaton with a quartic coupling that remains uncoupled after inflation is considered, too.

• OSTI ID: 6837790
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:10; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

661310* -- Relativity & Gravitation-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
COSMOLOGICAL MODELS
FIELD THEORIES
FLUCTUATIONS
INFLATIONARY UNIVERSE
MATHEMATICAL MODELS
PERTURBATION THEORY
QUANTUM FIELD THEORY
QUANTUM GRAVITY
SCALAR FIELDS
VARIATIONS