Nonequilibrium Dynamics of Quantum Fields in Inflationary Cosmology

@article{Ramsey1999NonequilibriumDO,
  title={Nonequilibrium Dynamics of Quantum Fields in Inflationary Cosmology},
  author={Stephen A. Ramsey},
  journal={International Journal of Theoretical Physics},
  year={1999},
  volume={38},
  pages={1299-1314}
}
  • S. Ramsey
  • Published 1 April 1999
  • Physics
  • International Journal of Theoretical Physics
We summarize a recent study (with B. L. Hu) ofthe nonequilibrium dynamics of an unbroken-symmetryinflaton field during postinflationary reheating, duringwhich the energy density contained in the expectation value of the inflaton field is rapidlytransferred to inhomogeneous quantum modes of theinflaton field. The coupled dynamics of the expectationvalue (mean field) of a scalar inflaton field with anunbroken global O(N) symmetry and its quantum varianceis studied using the leading-order, large… 
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Correlation entropy of an interacting quantum field and H theorem for the O ( N ) model
TLDR
An H-theorem is proved for the correlation entropy of a quantum mechanical O(N) model with a Closed Time Path Two Particle Irreducible Effective Action at the level of Next-to-Leading-Order large N approximation.

References

SHOWING 1-10 OF 64 REFERENCES
Nonequilibrium inflaton dynamics and reheating. II. Fermion production, noise, and stochasticity
We present a detailed and systematic analysis of the coarse-grained, nonequilibrium dynamics of a scalar inflaton field coupled to a fermion field in the latter stages of the reheating period of…
Nonequilibrium evolution of scalar fields in FRW cosmologies.
TLDR
It is found that a suitably defined nonequilibrium entropy per mode increases linearly with comoving time in a de Sitter cosmology, whereas it is [ital not] a monotonically increasing function in the radiation-dominated case.
Nonequilibrium quantum fields in the large-N expansion.
TLDR
A simple renormalization scheme that makes practical the numerical solution of the equations of motion of these and other field theories is described.
Nonequilibrium dynamics: Preheating in the SU(2) Higgs model
The term {open_quotes}preheating{close_quotes} has been introduced recently to denote the process in which energy is transferred from a classical inflaton field into fluctuating field (particle)…
Stationary solutions in Brans-Dicke stochastic inflationary cosmology.
TLDR
It is shown here that a nonminimal conformal coupling of the inflaton to the curvature scalar, as well as radiative corrections to the effective potential, may provide a dynamical cutoff and generate stationary solutions for chaotic inflation potentials.
Nonequilibrium dynamics of symmetry breaking in lambda Phi**4 field theory
The time evolution of O(N) symmetric lambda Phi^4 scalar field theory is studied in the large N limit. In this limit the mean field and two-point correlation function evolve together as a…
Analytic and numerical study of preheating dynamics.
TLDR
The phenomenon of preheating is analyzed using the Minkowski space O({ital N}) vector model in the large {ital N} limit to study the nonperturbative issues involved and rules out the possibility of symmetry restoration by nonequilibrium fluctuations in the cases relevant for new inflationary scenarios.
Nonequilibrium quantum fields: Closed-time-path effective action, Wigner function, and Boltzmann equation.
  • Calzetta, Hu
  • Physics
    Physical review. D, Particles and fields
  • 1988
TLDR
This paper treats a system of self-interacting bosons described by λφ4 scalar fields in flat space and adopts the closed-time-path (CTP) functional formalism and uses a two-particle irreducible (2PI) representation for the effective action.
Evolution equation for the expectation value of a scalar field in spatially flat RW universes
Linear versus nonlinear relaxation: Consequences for reheating and thermalization.
TLDR
It is found that particle production when the inflaton starts in the {ital nonlinear} region is typically a far more efficient way of transferring energy out ofThe inflaton zero mode and into the quanta of the lighter scalar than single particle decay.
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