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Related Experiment Videos

Nonlocal cosmology.

S Deser1, R P Woodard

  • 1California Institute of Technology, Pasadena, California 91125, and Department of Physics, Brandeis University, Waltham, Massachusetts 02454, USA. deser@brandeis.edu

Physical Review Letters
|October 13, 2007
PubMed
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Nonlocally modified gravity models explain cosmic acceleration by delaying responses to cosmic events. These theories avoid fine-tuning, with large numbers arising from vast time scales, and have negligible solar system effects.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Quantum Gravity

Background:

  • Current cosmic acceleration presents a significant challenge to standard cosmological models.
  • Explaining this acceleration often requires fine-tuning of cosmological parameters or the introduction of dark energy.
  • Quantum loop corrections offer a potential avenue for modifying gravitational theories.

Purpose of the Study:

  • To investigate nonlocally modified models of gravity as a mechanism for cosmic acceleration.
  • To explore theories that allow for delayed responses to cosmic events, such as the transition from radiation to matter dominance.
  • To assess the fine-tuning requirements and solar system effects of these modified gravity models.

Main Methods:

  • Theoretical exploration of nonlocally modified gravity inspired by quantum loop corrections.

Related Experiment Videos

  • Analysis of the models' ability to accommodate the transition from radiation to matter dominance.
  • Evaluation of fine-tuning aspects and comparison with Dirac's large number hypothesis.
  • Assessment of potential solar system deviations and implications for the black hole information problem.

    • Main Results:

    • Nonlocally modified gravity models provide a viable mechanism for explaining cosmic acceleration.
    • These models exhibit a delayed response to cosmic events, naturally fitting cosmological transitions.
    • The theories avoid typical fine-tuning issues, with large numbers emerging from large time scales.
    • Solar system effects are found to be negligible.

    Conclusions:

    • Nonlocally modified gravity offers a compelling alternative to standard dark energy models for cosmic acceleration.
    • The delayed response mechanism elegantly addresses cosmological transitions without fine-tuning.
    • These models hold promise for resolving astrophysical puzzles, including the black hole information problem.