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Stochastic fluctuations and structure formation in the Universe

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Original languageEnglish
Pages (from-to)458-461
Number of pages4
JournalPhysical Review Letters
Volume72
Issue number4
DOIs
StatePublished - 1994

Abstract

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 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.

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