Cosmological fluctuations of a random field and radiation fluid

Mar Bastero-Gil; Arjun Berera; Ian G. Moss; Rudnei O. Ramos

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

Cosmological fluctuations of a random field and radiation fluid

Mar Bastero-Gil^*, Arjun Berera, Ian G. Moss, Rudnei O. Ramos

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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.

Original language	English
Article number	004
Number of pages	32
Journal	Journal of Cosmology and Astroparticle Physics (JCAP)
Volume	2014
Issue number	05
DOIs	https://doi.org/10.1088/1475-7516/2014/05/004
Publication status	Published - May 2014

Keywords / Materials (for Non-textual outputs)

cosmological perturbation theory
inflation
CMBR theory
EXPECTATION VALUE FORMALISM
WARM INFLATION MODEL
DENSITY PERTURBATIONS
FINITE-TEMPERATURE
EARLY UNIVERSE
TRANSPORT-COEFFICIENTS
BOLTZMANN-EQUATION
BROWNIAN MOTION
QUANTUM
HYDRODYNAMICS

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10.1088/1475-7516/2014/05/004

bererapaper7Accepted author manuscript, 431 KB

Particle Theory at the Tait Institute
Ball, R., Berera, A., Boyle, P., Del Debbio, L., Figueroa-O'Farrill, J., Gardi, E., Horsley, R., Kennedy, A., Kenway, R., Pendleton, B. & Simon Soler, J.
STFC
1/10/11 → 30/09/15
Project: Research

Arjun Berera
- abph.ed.acuk
- School of Physics and Astronomy - Personal Chair in Theoretical Physics
Person: Academic: Research Active

Cite this

@article{5c687e565183486b9ad63bd72a2a7463,

title = "Cosmological fluctuations of a random field and radiation fluid",

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.",

keywords = "cosmological perturbation theory, inflation, CMBR theory, EXPECTATION VALUE FORMALISM, WARM INFLATION MODEL, DENSITY PERTURBATIONS, FINITE-TEMPERATURE, EARLY UNIVERSE, TRANSPORT-COEFFICIENTS, BOLTZMANN-EQUATION, BROWNIAN MOTION, QUANTUM, HYDRODYNAMICS",

author = "Mar Bastero-Gil and Arjun Berera and Moss, {Ian G.} and Ramos, {Rudnei O.}",

note = "23 pages; 4 figures",

year = "2014",

month = may,

doi = "10.1088/1475-7516/2014/05/004",

language = "English",

volume = "2014",

journal = "Journal of Cosmology and Astroparticle Physics (JCAP)",

issn = "1475-7516",

publisher = "IOP Publishing",

number = "05",

}

TY - JOUR

T1 - Cosmological fluctuations of a random field and radiation fluid

AU - Bastero-Gil, Mar

AU - Berera, Arjun

AU - Moss, Ian G.

AU - Ramos, Rudnei O.

N1 - 23 pages; 4 figures

PY - 2014/5

Y1 - 2014/5

N2 - 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.

AB - 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.

KW - cosmological perturbation theory

KW - inflation

KW - CMBR theory

KW - EXPECTATION VALUE FORMALISM

KW - WARM INFLATION MODEL

KW - DENSITY PERTURBATIONS

KW - FINITE-TEMPERATURE

KW - EARLY UNIVERSE

KW - TRANSPORT-COEFFICIENTS

KW - BOLTZMANN-EQUATION

KW - BROWNIAN MOTION

KW - QUANTUM

KW - HYDRODYNAMICS

U2 - 10.1088/1475-7516/2014/05/004

DO - 10.1088/1475-7516/2014/05/004

M3 - Article

SN - 1475-7516

VL - 2014

JO - Journal of Cosmology and Astroparticle Physics (JCAP)

JF - Journal of Cosmology and Astroparticle Physics (JCAP)

IS - 05

M1 - 004

ER -

Cosmological fluctuations of a random field and radiation fluid

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

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Particle Theory at the Tait Institute

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Arjun Berera

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