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Dense Axion Stars.

Eric Braaten1, Abhishek Mohapatra1, Hong Zhang1

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|October 1, 2016
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Summary
This summary is machine-generated.

Researchers discovered new, dense axion stars formed by gravity and Bose-Einstein condensate pressure. These stars, with masses up to solar mass, could form from the collapse of dilute axion stars, potentially triggering a bosenova.

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Area of Science:

  • Astrophysics
  • Particle Physics
  • Cosmology

Background:

  • Axion stars are stable, gravitationally bound systems of axions, a potential dark matter candidate.
  • Existing models describe dilute axion stars where gravity is balanced by kinetic pressure, limiting their mass.
  • The critical mass for dilute axion stars is approximately 10^-14 solar masses for axions of mass 10^-4 eV.

Purpose of the Study:

  • To investigate the existence and properties of dense axion stars.
  • To explore alternative mechanisms for axion star formation and stability.
  • To understand the potential astrophysical implications of dense axion stars.

Main Methods:

  • Utilizing a simplified approximation of the effective potential within the nonrelativistic effective field theory for axions.
  • Analyzing the balance between gravitational forces and mean-field pressure in a Bose-Einstein condensate of axions.

Main Results:

  • Identification of a new branch of dense axion stars.
  • These dense axion stars are supported by the mean-field pressure of an axion Bose-Einstein condensate, not kinetic pressure.
  • The mass range for these dense axion stars is substantial, from 10^-20 to approximately one solar mass.

Conclusions:

  • Dense axion stars represent a new class of stable axion configurations.
  • The collapse of a critical-mass dilute axion star could lead to a bosenova event and the formation of a dense axion star.
  • These findings expand our understanding of dark matter structures and their potential formation pathways.