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Dilaton-assisted dark matter.

Yang Bai1, Marcela Carena, Joseph Lykken

  • 1Theoretical Physics Department, Fermilab, Batavia, Illinois 60510, USA.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

A dilaton particle may mediate interactions between standard model particles and dark matter. Its properties, linked to dark matter abundance, constrain its mass and interactions, with potential detection via gamma-ray signals.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Dark matter interactions with the Standard Model are not fully understood.
  • A dilaton particle is a potential mediator for these interactions.
  • The relic abundance of dark matter provides a key constraint.

Purpose of the Study:

  • Investigate the dilaton as a dark matter messenger.
  • Relate dark matter properties (mass, spin) to the conformal breaking scale.
  • Predict dark matter-nucleon cross-sections and observable signals.

Main Methods:

  • Utilize dark matter relic abundance to constrain dilaton properties.
  • Calculate the dark matter-nucleon spin-independent cross-section.
  • Analyze constraints from LEP and Tevatron experiments.
  • Compute the gamma-ray signal from dark matter annihilation to dilatons.

Main Results:

  • The dilaton mass is predicted based on its relation to dark matter properties.
  • Current experimental data from LEP and Tevatron place constraints on the dilaton.
  • The Fermi Large Area Telescope could detect a specific gamma-ray signal from dark matter annihilation into dilatons.

Conclusions:

  • The dilaton is a viable candidate for mediating dark matter interactions.
  • Experimental constraints significantly limit dilaton properties.
  • Future gamma-ray observations hold potential for dilaton discovery.