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Axion Kinetic Misalignment Mechanism.

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This study proposes a new mechanism for axion dark matter, suggesting a nonzero initial velocity for the axion field. This allows for a lower axion decay constant than previously predicted.

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Area of Science:

  • Cosmology
  • Particle Physics

Background:

  • The conventional misalignment mechanism for axion dark matter assumes a constant initial field value.
  • Axion fields are crucial in theories addressing dark matter and early Universe cosmology.

Purpose of the Study:

  • To present an alternative scenario for axion dark matter production.
  • To explore the implications of a nonzero initial velocity for the axion field.
  • To investigate a mechanism for generating axion velocity from symmetry breaking.

Main Methods:

  • Theoretical modeling of the axion field dynamics in the early Universe.
  • Analysis of the axion decay constant under alternative initial conditions.
  • Investigating explicit breaking of axion shift symmetry.

Main Results:

  • A nonzero initial velocity for the axion field is proposed as an alternative to constant initial values.
  • This scenario allows for an axion decay constant significantly below conventional predictions.
  • Axion velocity can be generated through explicit breaking of approximate axion shift symmetry.

Conclusions:

  • The proposed scenario offers a new pathway for axion dark matter.
  • The findings suggest that axion properties might be more diverse than previously assumed.
  • Explicit breaking of shift symmetry provides a potential origin for the axion velocity.