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Dark matter caustics.

P Sikivie1, W Kinney

  • 1Department of Physics, New Physics Building, Corner N-S & Museum, University of Florida, Gainesville, Florida 32611, USA. sikivie@phys.ufl.edu, kinney@phys.ufl.edu

Annals of the New York Academy of Sciences
|June 20, 2001
PubMed
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Galactic halos feature density spikes called caustics. A study of galaxy rotation curves supports a model predicting caustic ring radii follow a specific mathematical law, aiding dark matter research.

Area of Science:

  • Cosmology and Astrophysics
  • Galaxy Formation and Evolution
  • Dark Matter Physics

Background:

  • Galactic halos are permeated by cold dark matter flows with defined velocity vectors.
  • These flows create regions of high dark matter density known as caustics.
  • Caustics manifest as spherical shells in the outer halo and ring structures in the inner halo.

Purpose of the Study:

  • To investigate the predicted relationship between caustic ring radii and their order in galactic halo formation.
  • To test the self-similar model's prediction of a specific mathematical law governing caustic ring radii.
  • To analyze observational data from galactic rotation curves for evidence supporting this theoretical prediction.

Main Methods:

  • Analysis of 32 extended and well-measured galactic rotation curves.

Related Experiment Videos

  • Comparison of observed data with predictions from the self-similar model of galactic halo formation.
  • Mathematical analysis to determine caustic ring radii and their scaling behavior.

    • Main Results:

    • Evidence was found supporting the self-similar model's prediction for caustic ring radii.
    • The observed caustic ring radii (a(n)) closely follow the approximate law a(n) ≈ 1/n.
    • This finding validates a key aspect of the self-similar model for galactic halo formation.

    Conclusions:

    • The study provides observational support for the self-similar model of galactic halo formation.
    • The identified law governing caustic ring radii offers a new tool for studying dark matter distribution.
    • These findings contribute to a deeper understanding of the structure and evolution of galactic halos.