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Related Experiment Videos

Massive graviton as a testable cold-dark-matter candidate.

S L Dubovsky1, P G Tinyakov, I I Tkachev

  • 1Department of Physics, CERN Theory Division, CH-1211 Geneva 23, Switzerland.

Physical Review Letters
|May 21, 2005
PubMed
Summary
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This study presents a gravity model with a massive graviton, explaining cosmic accelerated expansion and proposing nonrelativistic gravitational waves as a dark matter candidate detectable in future searches.

Area of Science:

  • Theoretical physics
  • Cosmology
  • Gravitational wave astronomy

Background:

  • The standard model of cosmology relies on dark energy for accelerated expansion.
  • The nature of dark matter remains elusive.
  • Gravitons are hypothetical elementary particles that mediate the force of gravitation.

Purpose of the Study:

  • To construct a consistent model of gravity with a massive tensor graviton mode.
  • To investigate the implications for cosmic accelerated expansion and dark matter.
  • To explore potential observational consequences for gravitational wave astronomy.

Main Methods:

  • Developing a theoretical framework for massive graviton gravity.
  • Analyzing the modified Friedmann equations to include a dark energy component.

Related Experiment Videos

  • Constraining the graviton mass using pulsar timing data.
  • Investigating the properties of nonrelativistic gravitational waves as a dark matter candidate.

    • Main Results:

    • A consistent model of gravity with a massive tensor graviton mode was constructed.
    • The Friedmann equation was shown to acquire an extra dark-energy component, driving accelerated expansion.
    • The graviton mass was constrained to be approximately (10^15 cm)^(-1) by pulsar timing measurements.
    • Nonrelativistic gravitational waves were identified as a potential cold dark matter candidate.

    Conclusions:

    • The massive graviton model provides a compelling alternative explanation for cosmic acceleration.
    • Nonrelativistic gravitational waves offer a novel dark matter candidate.
    • Future gravitational wave searches may detect these waves, providing evidence for the model.