Isocurvature baryon perturbations and inflation

Journal Article · Sun Jul 15 04:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.313· OSTI ID:6698262

Mollerach, S ^[1]

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1. International School for Advanced Studies, Strada Costiera 11, 34014 Trieste (Italy)

It has been observed that if an extra scalar field (in addition to the inflaton) is present during the inflationary phase, its decay into thermal radiation after baryogenesis gives rise to fluctuations in the initially smooth entropy-per-baryon ratio. There was a hope that these perturbations were of the isocurvature type and that they may help explain several observed features in the large-scale structure of the Universe. We study in detail the generation of perturbations in such a two-field inflationary model. We find that the resulting fluctuations are not of the isocurvature type, but that the entropy perturbation induces a curvature fluctuation which is larger than the entropic one before the wavelengths of the perturbations enter the Hubble radius. Thus, this model is not a good candidate to provide the initial conditions for the baryon isocurvature perturbations.

• OSTI ID: 6698262
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:2; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
645400 -- High Energy Physics-- Field Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON NUMBER
COSMOLOGICAL MODELS
COUPLING CONSTANTS
DECAY
ELECTROMAGNETIC RADIATION
ENERGY DENSITY
ENTROPY
HUBBLE EFFECT
INFLATIONARY UNIVERSE
MATHEMATICAL MODELS
PERTURBATION THEORY
PHYSICAL PROPERTIES
RADIATIONS
SCALAR FIELDS
THERMAL RADIATION
THERMODYNAMIC PROPERTIES