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
VL - 2014
JO - Journal of Cosmology and Astroparticle Physics (JCAP)
JF - Journal of Cosmology and Astroparticle Physics (JCAP)
SN - 1475-7516
IS - 05
M1 - 004
ER -