Evolution of perturbations in a baryon-dominated universe - Gauge-invariant analysis

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167516· OSTI ID:5508513

Gouda, N; Sasaki, M; Suto, Y ^[1]

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1. Kyoto Univ. (Japan)

The evolution of scalar (density) perturbations in a baryon-dominated universe is comprehensively studied on the basis of a gauge-invariant method. In particular, the residual anisotropies of the cosmic microwave background radiation are calculated and are compared with the recent observational upper limits. To the extent that the universe has not been reionized after recombination, the observed upper limits of the temperature anisotropies on small angular scales rule out the cosmological models without nonbaryonic dark matter. In turn, this would provide strong support for (nonbaryonic) dark matter, independently of the results of standard primordial nucleosynthesis. Reionization after recombination, if any, might allow an isocurvature baryonic universe as a viable model, only when the initial density power spectrum was very steep. 64 refs.

• OSTI ID: 5508513
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 341; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
ASTROPHYSICS
BARYONS
COMPARATIVE EVALUATIONS
COSMOLOGICAL MODELS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
FLUCTUATIONS
GAUGE INVARIANCE
HADRONS
INVARIANCE PRINCIPLES
LIMITING VALUES
MATHEMATICAL MODELS
MICROWAVE RADIATION
NONLUMINOUS MATTER
PERTURBATION THEORY
RADIATIONS
RECOMBINATION
RELICT RADIATION
UNIVERSE
VARIATIONS