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Mar Bastero-Gil1, Arjun Berera2, Rudnei O Ramos3

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|October 22, 2016
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This study introduces a novel warm inflation model where a pseudo Nambu-Goldstone boson drives cosmic inflation at finite temperatures. This model aligns with Planck data and requires minimal fields, offering a new perspective on early universe cosmology.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Theoretical Physics

Background:

  • The standard inflationary paradigm explains the early universe's homogeneity and flatness.
  • Warm inflation models propose inflation occurs in a thermal bath, differing from standard cold inflation.
  • Previous warm inflation models often required complex field content or lacked observational support.

Purpose of the Study:

  • To propose a new, simplified warm inflation model.
  • To demonstrate that inflation can be sustained by dissipative effects at finite temperatures.
  • To investigate the observational consequences of this model using Planck satellite data.

Main Methods:

  • Utilizing a pseudo Nambu-Goldstone boson as the inflaton field.
  • Analyzing the protective mechanisms for the inflaton potential against divergences and thermal corrections.
  • Investigating nonlocal dissipative effects sustaining a thermal bath during accelerated expansion.
  • Examining the dynamics of chaotic warm inflation with a quartic potential.

Main Results:

  • Inflation naturally occurs at a finite temperature (T>H) sustained by dissipation.
  • The inflaton potential is protected by symmetry, similar to Little Higgs models.
  • Nonlocal dissipative effects maintain a near-thermal bath of particles during inflation.
  • The model's predictions show excellent agreement with Planck observational results.

Conclusions:

  • This work presents the first realization of warm inflation with a minimal field content.
  • The proposed model offers a viable and observationally consistent explanation for early universe dynamics.
  • The findings suggest a natural connection between broken gauge symmetries and sustained inflation.