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Thermal background can solve the cosmological moduli problem.

Jun'ichi Yokoyama1

  • 1Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Japan.

Physical Review Letters
|May 23, 2006
PubMed
Summary

Weakly massive moduli fields can efficiently dissipate energy through derivative couplings in a thermal bath. This offers a novel solution to the cosmological moduli problem, avoiding late-time entropy generation.

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Area of Science:

  • Cosmology
  • Particle Physics

Background:

  • The cosmological moduli problem arises from the slow decay of scalar fields (moduli) with masses around the weak or TeV scale.
  • These moduli fields can dominate the energy density of the universe, leading to cosmological issues if they do not decay efficiently.

Purpose of the Study:

  • To investigate a mechanism for efficient energy dissipation of moduli fields.
  • To provide a new solution to the cosmological moduli problem.

Main Methods:

  • Analyzing the energy dissipation of coherent field oscillations of moduli fields.
  • Considering derivative couplings to standard bosonic fields in a thermal state.

Main Results:

  • Coherent field oscillations of moduli fields with weak or TeV scale masses can dissipate energy efficiently.
  • This energy dissipation occurs when moduli fields possess derivative couplings to standard bosonic fields in a thermal state.

Conclusions:

  • The proposed mechanism offers a viable solution to the cosmological moduli problem.
  • This mechanism avoids the generation of excessive entropy at late times in the universe.

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