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Fluid Dark Matter.

Peebles

    The Astrophysical Journal
    |May 17, 2000
    PubMed
    Summary
    This summary is machine-generated.

    Dark matter, modeled as a classical scalar field, may behave like an ideal fluid. This model could explain observable effects on dark matter halos and the early universe's structure.

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    Area of Science:

    • Cosmology
    • Particle Physics
    • Astrophysics

    Background:

    • The nature of dark matter remains one of the most significant unsolved problems in modern physics.
    • Current models often treat dark matter as cold and collisionless, which may not fully capture its complex behavior.
    • Inflationary cosmology provides a framework for understanding the early universe's rapid expansion and the origin of structure.

    Purpose of the Study:

    • To investigate a novel model for dark matter based on a classical scalar field.
    • To explore the potential observational consequences of this scalar field dark matter model.
    • To connect theoretical dark matter properties with astrophysical and cosmological observations.

    Main Methods:

    • Modeling dark matter as a classical scalar field with a specific potential (quartic at large values, quadratic at small values).

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  • Investigating gravitational production of this field during inflation.
  • Analyzing the behavior of the scalar field as an ideal fluid at the present epoch.
  • Examining the model's predictions for dark matter halo properties and the primordial power spectrum.

    • Main Results:

    • The proposed scalar field dark matter model can act as an ideal fluid with pressure dependent on mass density.
    • This fluid-like behavior could lead to observable effects on the core radii and solid-body rotation of dark matter halos.
    • The model may also influence the low-mass end of the primeval mass fluctuation power spectrum.

    Conclusions:

    • A classical scalar field with a specific potential offers a viable alternative model for dark matter.
    • This model provides testable predictions for the structure and dynamics of dark matter halos.
    • Further research can explore the implications for large-scale structure formation and early universe cosmology.