Stochastic fluctuations and structure formation in the Universe

It is shown that the evolution of the density perturbations during certain eras of substantial entropy generation in the Universe can be described in the scheme of the Kardar-Parizi-Zhang equation. Therefore, the influence on cosmological structure formation by stochastic forces arising from various...

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Bibliographic Details
Published in:Physical review letters 1994-01, Vol.72 (4), p.458-461
Main Authors: Berera, A, Fang, LZ
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COSMOLOGICAL MODELS
DENSITY
DOMAIN STRUCTURE
ENTROPY
FLUCTUATIONS
INFLATIONARY UNIVERSE
MATHEMATICAL MODELS
NOISE
PERTURBATION THEORY
PHYSICAL PROPERTIES
SCALAR FIELDS
SCALING
STOCHASTIC PROCESSES
THERMODYNAMIC PROPERTIES
VARIATIONS 661310 > Relativity & Gravitation-- (1992-)
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Summary:It is shown that the evolution of the density perturbations during certain eras of substantial entropy generation in the Universe can be described in the scheme of the Kardar-Parizi-Zhang equation. Therefore, the influence on cosmological structure formation by stochastic forces arising from various dissipations can be studied through the universal characteristics of surface growth in [ital d]=3+1 dimensions. We identify eras of strong stochastic fluctuations and describe dynamically how these other dissipative sources of noise, besides initial (inflationary) quantum fluctuations, generate seeds of density perturbation with power law spectrum, including the Harrison-Zeldovich spectrum.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.72.458