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Related Experiment Videos

Non-Gaussianity from preheating.

Kari Enqvist1, Asko Jokinen, Anupam Mazumdar

  • 1Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki, Finland.

Physical Review Letters
|May 21, 2005
PubMed
Summary
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Parametric resonance in a two-field inflation model amplifies metric perturbations, significantly boosting non-Gaussianity. This finding may offer a new method for testing cosmic inflation and preheating in future cosmic microwave background experiments.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Astrophysics

Background:

  • Cosmic inflation is a leading theory explaining the early universe's rapid expansion.
  • Preheating is a crucial, yet not fully understood, phase following inflation.
  • Parametric resonance is a phenomenon where small oscillations amplify over time.

Purpose of the Study:

  • To investigate a two-field model of cosmic inflation.
  • To explore the impact of parametric resonance on metric perturbations during preheating.
  • To quantify the resulting non-Gaussianity in the cosmic microwave background.

Main Methods:

  • Utilizing a two-field model for inflation.
  • Analyzing the amplification of second-order metric perturbations via parametric resonance.

Related Experiment Videos

  • Calculating the enhancement of non-Gaussianity from coupled perturbations.

    • Main Results:

    • Parametric resonance significantly amplifies metric perturbations during preheating.
    • A considerable enhancement of non-Gaussianity is observed, sourced by local terms.
    • The non-Gaussianity parameter, f(NL), can reach approximately 50.

    Conclusions:

    • The studied inflationary model predicts significant non-Gaussianity.
    • This predicted non-Gaussianity could be detectable in future cosmic microwave background experiments.
    • The findings offer a potential new observational test for preheating mechanisms in cosmology.