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Natural chaotic inflation in supergravity

Kawasaki1, Yamaguchi, Yanagida

  • 1Research Center for the Early Universe, University of Tokyo, Tokyo, 113-0033, Japan.

Physical Review Letters
|October 13, 2000
PubMed
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We present a new chaotic inflation model within supergravity. This model utilizes a shift symmetry in the Kahler potential to ensure a flat inflaton potential, naturally leading to chaotic inflation with a small superpotential breaking term.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Supergravity

Background:

  • Inflationary cosmology models explain the early universe's rapid expansion.
  • Supergravity provides a framework for unifying gravity with quantum field theory.
  • Flat inflaton potentials are crucial for successful inflationary models.

Purpose of the Study:

  • To propose a novel chaotic inflation model within the supergravity framework.
  • To investigate the role of Nambu-Goldstone-type shift symmetry in ensuring potential flatness.
  • To demonstrate how a small superpotential breaking term can naturally trigger chaotic inflation.

Main Methods:

  • Utilizing a Kahler potential with a Nambu-Goldstone-type shift symmetry for the inflaton chiral multiplet.
  • Introducing a small breaking term in the superpotential to break the shift symmetry.

Related Experiment Videos

  • Analyzing the resulting inflaton potential and its inflationary dynamics.

    • Main Results:

    • The proposed model ensures inflaton potential flatness beyond the Planck scale due to the shift symmetry.
    • Chaotic inflation naturally occurs by introducing a small breaking term in the superpotential.
    • The model provides a consistent mechanism for chaotic inflation within supergravity.

    Conclusions:

    • The study introduces a viable supergravity model for chaotic inflation.
    • Shift symmetry in the Kahler potential is key to achieving a flat inflaton potential.
    • This work offers a new avenue for building inflationary cosmology models in supergravity.