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Low Mass Black Holes from Dark Core Collapse.

Basudeb Dasgupta1, Ranjan Laha2,3, Anupam Ray1

  • 1Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.

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Gravitational wave discoveries reveal unusual black hole masses. A new theory suggests dark matter accretion by stars forms these low-mass black holes, challenging stellar evolution models.

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Area of Science:

  • Astrophysics
  • Cosmology
  • Particle Physics

Background:

  • Gravitational wave astronomy has detected black holes with masses challenging conventional stellar evolution.
  • The Chandrasekhar limit (approximately 1.4 solar masses) makes forming low-mass black holes via stellar collapse improbable.
  • The origin of these unusual black hole masses remains a fundamental question in astrophysics.

Purpose of the Study:

  • Propose a novel astrophysical channel for the formation of low-mass black holes.
  • Explain how dark matter accretion can lead to black hole masses below the Chandrasekhar limit.
  • Provide testable predictions to verify this new formation mechanism.

Main Methods:

  • Theoretical modeling of stellar objects accreting non-annihilating dark matter.
  • Analysis of the subsequent collapse of a dark matter core within a star.
  • Investigating the implications for black hole mass distributions.

Main Results:

  • A new black hole formation channel is proposed: catastrophic accretion of dark matter by stars.
  • This mechanism allows for the formation of black holes with masses below the standard Chandrasekhar limit.
  • The effective Chandrasekhar limit can be reduced by the presence and mass range of dark matter.

Conclusions:

  • The proposed dark matter accretion channel offers a plausible explanation for observed low-mass black holes.
  • The redshift dependence of the black hole merger rate can serve as a crucial observational test.
  • Verifying this formation pathway could significantly impact our understanding of stellar evolution and dark matter properties.