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Cosmological fluctuations of a random field and radiation fluid

Lookup NU author(s): Professor Ian MossORCiD

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Abstract

A generalization of the random fluid hydrodynamic fluctuation theory due to Landau and Lifshitz is applied to describe cosmological fluctuations in systems with radiation and scalar fields. The viscous pressures, parametrized in terms of the bulk and shear viscosity coefficients, and the respective random fluctuations in the radiation fluid are combined with the stochastic and dissipative scalar evolution equation. This results in a complete set of equations describing the perturbations in both scalar and radiation fluids. These derived equations are then studied, as an example, in the context of warm inflation. Similar treatments can be done for other cosmological early universe scenarios involving thermal or statistical fluctuations.

Publication metadata

Author(s): Baster-Gil M, Berera A, Moss IG, Ramos RO

Publication type: Article

Publication status: Published

Journal: Journal of Cosmology and Astroparticle Physics

Year: 2014

Volume: 2014

Online publication date: 06/05/2014

Acceptance date: 02/04/2014

Date deposited: 19/01/2016

ISSN (electronic): 1475-7516

Publisher: IOP Publishing

URL: http://dx.doi.org/10.1088/1475-7516/2014/05/004

DOI: 10.1088/1475-7516/2014/05/004

Notes: arXiv:1401.1149v1 green open access

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