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Related Experiment Videos

Reheating as a surface effect.

Kari Enqvist1, Shinta Kasuya, Anupam Mazumdar

  • 1Department of Physical Sciences, P.O. Box 64, FIN-00014, University of Helsinki, Finland.

Physical Review Letters
|August 23, 2002
PubMed
Summary
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A novel mechanism for reheating the Universe involves inflaton condensate evaporation. This process yields lower temperatures than standard decay, potentially solving overproduction issues in inflationary cosmology without fine-tuning.

Area of Science:

  • Cosmology
  • Particle Physics
  • Inflationary Theory

Background:

  • Cosmic reheating is crucial for the hot Big Bang phase after inflation.
  • Standard reheating models face challenges like overproduction of unwanted particles.
  • Inflaton condensate fragmentation is a proposed early-universe phenomenon.

Purpose of the Study:

  • To introduce and analyze a new reheating mechanism via inflaton condensate surface charge evaporation.
  • To compare the reheat temperature from this new mechanism with standard perturbative decay.
  • To investigate the implications for solving overproduction problems in inflationary cosmology.

Main Methods:

  • Theoretical modeling of inflaton condensate fragmentation and evaporation.
  • Calculation of reheat temperature based on surface charge evaporation.

Related Experiment Videos

  • Analysis of Yukawa coupling effects on reheating and particle production.

    • Main Results:

    • Evaporation of a surface charge provides a new reheating channel.
    • This mechanism results in significantly lower reheat temperatures compared to perturbative decay for a range of Yukawa couplings.
    • The reduced reheat temperature offers a potential solution to gravitino and moduli overproduction.

    Conclusions:

    • Surface charge evaporation offers a viable alternative reheating mechanism.
    • It naturally alleviates overproduction issues in inflationary models.
    • This mechanism avoids the need for fine-tuning the inflaton's Yukawa coupling.