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Annihilating cold dark matter

Kaplinghat1, Knox, Turner

  • 1Department of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis Avenue, Chicago, Illinois 60637, USA.

Physical Review Letters
|October 13, 2000
PubMed
Summary
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Cold dark matter (CDM) simulations predict dense central cusps in halos, contrary to observations. Self-annihilating CDM particles can soften these cusps, potentially resolving this discrepancy and aligning with observed halo properties.

Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Standard Cold Dark Matter (CDM) models predict central density cusps in dark matter halos.
  • These predicted cusps are in tension with observational data, which suggest flatter core profiles.

Purpose of the Study:

  • To investigate if particle physics properties of CDM can resolve the cusp-core discrepancy.
  • To explore the implications of CDM particle annihilation on halo structure formation.

Main Methods:

  • Theoretical modeling of structure formation with self-annihilating CDM.
  • Analysis of the impact of annihilation cross-section (sigmav) on halo density profiles.
  • Consideration of scenarios to avoid early Universe annihilation catastrophes.

Related Experiment Videos

Main Results:

  • CDM particle annihilation with sigmav ~ 10^-29(m/GeV) cm^2 softens central cusps.
  • The velocity dependence of sigmav influences the scaling of core density with halo mass.
  • S-wave annihilation leads to a core density nearly independent of halo mass.

Conclusions:

  • Self-annihilating CDM offers a potential solution to the cusp-core problem.
  • Observed halo core densities are consistent with s-wave annihilation of CDM particles.
  • Further investigation into early Universe constraints on annihilation scenarios is warranted.