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Adiabatic and entropy perturbations with interacting fluids and fields

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Adiabatic and entropy perturbations with interacting fluids and fields. / Malik, Karim A.; Wands, David.
In: Journal of Cosmology and Astroparticle Physics, Vol. 0502, 02.2005, p. 007.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Malik, KA & Wands, D 2005, 'Adiabatic and entropy perturbations with interacting fluids and fields', Journal of Cosmology and Astroparticle Physics, vol. 0502, pp. 007. https://doi.org/10.1088/1475-7516/2005/02/007

APA

Malik, K. A., & Wands, D. (2005). Adiabatic and entropy perturbations with interacting fluids and fields. Journal of Cosmology and Astroparticle Physics, 0502, 007. https://doi.org/10.1088/1475-7516/2005/02/007

Vancouver

Malik KA, Wands D. Adiabatic and entropy perturbations with interacting fluids and fields. Journal of Cosmology and Astroparticle Physics. 2005 Feb;0502:007. doi: 10.1088/1475-7516/2005/02/007

Author

Malik, Karim A. ; Wands, David. / Adiabatic and entropy perturbations with interacting fluids and fields. In: Journal of Cosmology and Astroparticle Physics. 2005 ; Vol. 0502. pp. 007.

Bibtex

@article{1b995e1c978d442988958dafc0e3ed0d,
title = "Adiabatic and entropy perturbations with interacting fluids and fields",
abstract = "We develop a gauge-invariant formalism for the study of density perturbations in a Friedmann–Robertson–Walker universe with multiple interacting fluids and/or scalar fields. We show how N scalar fields may be described by N kinetic fluids (with maximally stiff equation of state) interacting with a non-dynamical potential (with vacuum equation of state). We split generic perturbations into adiabatic and entropic parts, and give the coupled first-order evolution equations on all scales, including energy and momentum exchange. We identify the non-adiabatic effects on large scales, and define adiabatic initial conditions in the presence of multiple fluids and fields.",
keywords = "cosmological perturbation theory, physics of the early universe",
author = "Malik, {Karim A.} and David Wands",
year = "2005",
month = feb,
doi = "10.1088/1475-7516/2005/02/007",
language = "English",
volume = "0502",
pages = "007",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",

}

RIS

TY - JOUR

T1 - Adiabatic and entropy perturbations with interacting fluids and fields

AU - Malik, Karim A.

AU - Wands, David

PY - 2005/2

Y1 - 2005/2

N2 - We develop a gauge-invariant formalism for the study of density perturbations in a Friedmann–Robertson–Walker universe with multiple interacting fluids and/or scalar fields. We show how N scalar fields may be described by N kinetic fluids (with maximally stiff equation of state) interacting with a non-dynamical potential (with vacuum equation of state). We split generic perturbations into adiabatic and entropic parts, and give the coupled first-order evolution equations on all scales, including energy and momentum exchange. We identify the non-adiabatic effects on large scales, and define adiabatic initial conditions in the presence of multiple fluids and fields.

AB - We develop a gauge-invariant formalism for the study of density perturbations in a Friedmann–Robertson–Walker universe with multiple interacting fluids and/or scalar fields. We show how N scalar fields may be described by N kinetic fluids (with maximally stiff equation of state) interacting with a non-dynamical potential (with vacuum equation of state). We split generic perturbations into adiabatic and entropic parts, and give the coupled first-order evolution equations on all scales, including energy and momentum exchange. We identify the non-adiabatic effects on large scales, and define adiabatic initial conditions in the presence of multiple fluids and fields.

KW - cosmological perturbation theory

KW - physics of the early universe

U2 - 10.1088/1475-7516/2005/02/007

DO - 10.1088/1475-7516/2005/02/007

M3 - Journal article

VL - 0502

SP - 007

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

ER -