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Fuzzy Dark Matter from Infrared Confining Dynamics.

Hooman Davoudiasl1, Christopher W Murphy1

  • 1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.

Physical Review Letters
|April 22, 2017
PubMed
Summary
This summary is machine-generated.

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A new fuzzy dark matter model proposes a very light boson as a dark matter candidate. This model offers a novel explanation for dark matter properties and predicts testable cosmological signatures.

Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Dark matter (DM) candidates face phenomenological challenges.
  • A very light boson (O(10^{-22}) eV) is a potential dark matter candidate, termed fuzzy DM (FDM).
  • FDM could be an axion with specific decay constants and masses.

Purpose of the Study:

  • Propose a concrete model for fuzzy dark matter (FDM).
  • Explain the dynamical origin of the mass scale (μ) from infrared confining dynamics, analogous to QCD.
  • Offer an alternative to string theoretic instanton effects for generating μ.

Main Methods:

  • Develop a theoretical model for FDM based on dynamical scales.
  • Analyze cosmological constraints on the proposed FDM scenario.

Related Experiment Videos

  • Investigate implications for early universe cosmology, including inflation and reheating.

    • Main Results:

    • Cosmological constraints suggest a period of mild inflation, possibly from a strong first-order phase transition.
    • The model predicts reheating of the standard model (SM) sector only.
    • A key prediction is a larger effective number of neutrinos (N_{eff}) than the SM value.

    Conclusions:

    • The proposed FDM model offers a viable alternative to existing dark matter candidates.
    • The scenario predicts observable signatures such as an increased N_{eff}, potentially linked to sterile neutrinos.
    • Aspects of this FDM model may be testable in terrestrial experiments, offering novel avenues for verification.