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Related Experiment Videos

Brane world solution to the cosmological constant problem.

S H Tye1, I Wasserman

  • 1Laboratory for Nuclear Studies, Cornell University, Ithaca, New York 14853, USA. tye@mail.lns.cornell.edu

Physical Review Letters
|April 6, 2001
PubMed
Summary
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In a five-dimensional spacetime model, increasing the distance between two parallel 3-branes exponentially reduces the four-dimensional cosmological constant observed on one brane. This finding is significant for understanding large-scale cosmic structures.

Area of Science:

  • Theoretical Physics
  • Cosmology
  • String Theory

Background:

  • Investigates a five-dimensional spacetime model with two parallel 3-branes.
  • Focuses on the interbrane space, specifically anti-de Sitter or similar conditions without event horizons.

Purpose of the Study:

  • To analyze the behavior of the effective four-dimensional cosmological constant.
  • To determine how this constant changes with the separation distance (L) between the branes.

Main Methods:

  • Utilizes a theoretical model of intersecting branes in higher-dimensional spacetime.
  • Applies principles of general relativity and field theory in the context of branes.

Main Results:

  • The effective four-dimensional cosmological constant observed on the visible brane decreases exponentially as the interbrane distance L increases.

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  • This exponential suppression is contingent on the interbrane space being anti-de Sitter or lacking event horizons.

    • Conclusions:

    • The model provides a mechanism for generating an extremely small cosmological constant in four dimensions.
    • Suggests implications for reconciling theoretical models with cosmological observations of dark energy.