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Related Experiment Videos

Moduli-induced gravitino problem.

Motoi Endo1, Koichi Hamaguchi, Fuminobu Takahashi

  • 1Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.

Physical Review Letters
|June 29, 2006
PubMed
Summary

The cosmological moduli problem persists even with heavier modulus particles. Gravitino production during modulus decay leads to a significant cosmological disaster, indicating current solutions are insufficient.

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Area of Science:

  • Cosmology
  • Particle Physics
  • String Theory

Background:

  • The cosmological moduli problem is a significant challenge in particle physics and cosmology.
  • Understanding the decay of modulus particles is crucial for early universe cosmology.

Purpose of the Study:

  • To investigate the cosmological moduli problem by analyzing modulus decay.
  • To determine the impact of gravitino production on cosmological models.

Main Methods:

  • Detailed study of modulus decay.
  • Calculation of the branching ratio for gravitino production.
  • Analysis of the mixed modulus-anomaly model.

Main Results:

  • The branching ratio for gravitino production is generically between 0.01 and 1.
  • This high ratio indicates a significant cosmological disaster.
  • Increasing modulus mass beyond 100 TeV does not solve the problem.

Conclusions:

  • The cosmological moduli problem is not resolved by simply increasing modulus mass.
  • Gravitino production during modulus decay poses a fundamental challenge to cosmological models.

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