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Area of Science:

  • Cosmology
  • Particle Physics
  • Theoretical Physics

Background:

  • The gravitational neutrino mass model predicts a postrecombination phase transition.
  • This transition involves the spontaneous breaking of neutrino flavor symmetry.

Purpose of the Study:

  • To investigate the formation and evolution of topological defects in this predicted phase transition.
  • To explore the observational signatures of these defects, particularly their dependence on neutrino properties.

Main Methods:

  • Theoretical study of topological defect formation.
  • Analysis of the implications of neutrino flavor symmetry breaking.
  • Comparison with existing experimental data.

Main Results:

  • Global skyrmions, monopoles, strings, and domain walls form during the transition.
  • Defect properties differ based on whether neutrinos are Majorana or Dirac.
  • Existing data constrain parameters in the Majorana neutrino case.

Conclusions:

  • The study identifies unique, low-energy topological defects arising from neutrino mass models.
  • Observational signatures, like a time and space-dependent neutrino mass matrix, are predicted.
  • Future experiments could distinguish between Dirac and Majorana neutrino nature by detecting these effects.