Asymptotic behavior of the warm inflation scenario with viscous pressure

Physical review D: Particles and fields 12/2005; DOI: 10.1103/PhysRevD.73.023502
Source: arXiv

ABSTRACT We analyze the dynamics of models of warm inflation with general dissipative effects. We consider phenomenological terms both for the inflaton decay rate and for viscous effects within matter. We provide a classification of the asymptotic behavior of these models and show that the existence of a late-time scaling regime depends not only on an asymptotic behavior of the scalar field potential, but also on an appropriate asymptotic behavior of the inflaton decay rate. There are scaling solutions whenever the latter evolves to become proportional to the Hubble rate of expansion regardless of the steepness of the scalar field exponential potential. We show from thermodynamic arguments that the scaling regime is associated to a power-law dependence of the matter-radiation temperature on the scale factor, which allows a mild variation of the temperature of the matter/radiation fluid. We also show that the late time contribution of the dissipative terms alleviates the depletion of matter, and increases the duration of inflation. Comment: 31 pages, 2 figures, 3 tables. PACS numbers: 98.80Cq, 47.75+f

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Warm inflationary universe models on a warped Dvali–Gabadadze–Porrati brane are studied. General conditions required for these models to be realizable are derived and discussed. By using an effective exponential potential we develop models for constant and variable dissipation coefficient ratio . We use recent astronomical observations for constraining the parameters appearing in our models.
    Physics Letters B 09/2007; · 4.57 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Warm-intermediate inflationary universe models in the context of braneworld cosmologies are studied. This study is done in the weak and strong dissipative regimes. We find that the scalar potentials and dissipation coefficients in terms of the scalar field evolve as type-power-law and powers of logarithms, respectively. General conditions required for these models to be realizable are derived and discussed. We also study the scalar and tensor perturbations for each regime. We use recent astronomical observations to constrain the parameters appearing in the braneworld models.
    European Physical Journal C 01/2011; 71(7):1-9. · 5.25 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The position of a mobile D-3 brane moving towards a stack of localized D-5 branes has been studied as a candidate driving inflation in the warm inflationary scenario. We find that the observables remain well within the recent observational constraint for a set of allowed model parameters. We also discuss the non-gaussianity generated during inflation in this model.

Full-text (2 Sources)

Available from
Jun 4, 2014