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Setting Limits on Supersymmetry Using Simplified Models
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Scalar Relics from the Hot Big Bang.

David Cyncynates1, Olivier Simon2

  • 1University of Washington, Department of Physics, Seattle, Washington 98195, USA.

Physical Review Letters
|September 22, 2025
PubMed
Summary

Weakly interacting scalar fields can explain the universe's dark matter abundance. This finding connects fifth force experiments with dark matter searches across a wide mass range.

Area of Science:

  • Cosmology
  • Particle Physics

Background:

  • The nature of dark matter remains one of the most significant unsolved problems in modern physics.
  • The Standard Model of particle physics does not account for dark matter, necessitating extensions or new physics.

Purpose of the Study:

  • To investigate if scalar fields with specific coupling strengths can naturally explain the observed cosmological dark matter abundance.
  • To explore the mass range and coupling properties of such scalar fields.

Main Methods:

  • Theoretical modeling of scalar field dynamics and their interactions with Standard Model particles.
  • Analysis of cosmological dark matter abundance predictions based on scalar field couplings.

Main Results:

  • Scalar field couplings, approximately 10^{-6}(m_{ϕ}/eV)^{-1/4} relative to gravity, can account for the total dark matter abundance.

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  • This explanation is valid for a broad scalar field mass range from 10^{-12} to 10^{14} eV.
  • The results are robust, showing minimal sensitivity to the specific Standard Model particles (electrons, photons, hadrons) the scalar field couples to.

    • Conclusions:

    • Scalar fields provide a compelling candidate for dark matter that unifies cosmological observations with particle physics.
    • The findings establish a direct link between fifth force experiments, probing deviations from gravity, and the ongoing search for dark matter particles.