Collapse of Small-Scale Density Perturbations during Preheating in Single Field Inflation

@article{Jedamzik2010CollapseOS,
  title={Collapse of Small-Scale Density Perturbations during Preheating in Single Field Inflation},
  author={Karsten Jedamzik and Martin Lemoine and J{\'e}r{\^o}me Martin},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2010},
  volume={2010},
  pages={034-034}
}
After cosmic inflation and before the transition to radiation domination, the cosmic energy density may have been dominated during an extended period by an oscillating massive scalar condensate. We show that during this period, sub-Hubble scale perturbations are subject to a metric preheating instability in the narrow resonance regime. We analyze in detail both, quadratic and quartic potentials. The instability leads to the growth of density perturbations which in many cases become non-linear… Expand

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References

SHOWING 1-10 OF 85 REFERENCES
Parametric Amplification of Gravitational Fluctuations during Reheating
Cosmological perturbations can undergo amplification by parametric resonance during preheating even on scales larger than the Hubble radius, without violating causality. A unified description ofExpand
Delayed Reheating and the Breakdown of Coherent Oscillations
We analyze the evolution of the perturbations in the inflaton field and metric following the end of inflation. We present accurate analytic approximations for the perturbations, showing that theExpand
Evolution of cosmological perturbations during reheating
The behavior of scalar perturbations on superhorizon scales during the reheating stage is investigated by replacing the rapidly oscillating inflaton field by a perfect fluid obtained by spacetimeExpand
Evolution of Cosmological Perturbations in a Stage Dominated by an Oscillatory Scalar Field
In the investigation of the evolution of cosmological perturbations in inflationary universe models the behavior of perturbations during the reheating stage is the most unclear point. In particularExpand
Towards the theory of reheating after inflation
Reheating after inflation occurs due to particle production by the oscillating inflaton field. In this paper we describe the perturbative approach to reheating, and then concentrate on effects beyondExpand
Inflationary Cosmological Perturbations of Quantum-Mechanical Origin
This review article aims at presenting the theory of inflation. We first describe the background spacetime behavior during the slow-roll phase and analyze how inflation ends and the Universe reheats.Expand
Inflation dynamics and reheating
The theory of inflation with single and multiple fields is reviewed paying particular attention to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the primary means ofExpand
Gauge Invariant Cosmological Perturbations
The physical interpretation of perturbations of homogeneous, isotropic cosmological models in the early Universe, when the perturbation is larger than the particle horizon, is clarified by defining aExpand
Higher order corrections to primordial spectra from cosmological inflation
Abstract We calculate power spectra of cosmological perturbations at high accuracy for two classes of inflation models. We classify the models according to the behaviour of the Hubble distance duringExpand
Resonance Structure for Preheating with Massless Fields
We extend recent work on the resonance structure for post-inflation reheating, providing an analytic treatment for models in which both the inflaton and the fields into which it decays are massless.Expand
...
1
2
3
4
5
...