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Superweakly interacting massive particle solutions to small scale structure problems.

Jose A R Cembranos1, Jonathan L Feng, Arvind Rajaraman

  • 1Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.

Physical Review Letters
|December 31, 2005
PubMed
Summary
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Super-WIMP dark matter resolves small-scale structure problems that plague standard weakly interacting massive particles (WIMPs). This new model preserves WIMP successes on large scales while fixing issues with galaxy formation on smaller scales.

Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Cold dark matter, specifically weakly interacting massive particles (WIMPs), is theoretically favored and explains large-scale cosmic structure.
  • However, WIMPs fail on small scales, predicting excessive subhalos and overly dense galactic cores, contradicting observational data.

Purpose of the Study:

  • To investigate super-WIMP dark matter as a potential solution to small-scale structure problems.
  • To determine if super-WIMPs can reconcile WIMP successes on large scales with observational discrepancies on small scales.

Main Methods:

  • The study considers super-WIMP dark matter produced via late-time decays (10^5 - 10^8 s).
  • Analysis is based on the properties of super-WIMPs, including their free-streaming lengths and phase space densities, drawing from prior general analyses.

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Main Results:

  • Super-WIMPs exhibit larger free-streaming lengths compared to standard WIMPs.
  • Super-WIMPs possess lower phase space densities, mitigating small-scale structure issues.
  • The proposed model maintains the successful predictions of WIMPs for large-scale structure formation.

Conclusions:

  • Super-WIMP dark matter offers a viable alternative that resolves the small-scale challenges faced by traditional WIMP models.
  • This dark matter candidate preserves the cosmological successes of WIMPs while addressing conflicts with observations of galactic structures.