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String inspired brane world cosmology.

Cristiano Germani1, Carlos F Sopuerta

  • 1Institute of Cosmology and Gravitation, Portsmouth University, Portsmouth PO1 2EG, United Kingdom.

Physical Review Letters
|June 13, 2002
PubMed
Summary
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Superstring theory corrections to Einstein-Hilbert action lead to time-varying gravity and cosmological constants in brane worlds. Bulk geometry and black hole mass influence these variations, impacting early universe cosmology.

Area of Science:

  • Theoretical physics
  • Cosmology
  • String theory

Background:

  • Brane world scenarios explore gravity in higher dimensions.
  • Superstring theory suggests corrections to Einstein-Hilbert action, like the Gauss-Bonnet term.
  • Randall-Sundrum models provide a framework for brane worlds.

Purpose of the Study:

  • To investigate cosmological dynamics in brane world scenarios with Gauss-Bonnet corrections.
  • To analyze the implications of these corrections on gravitational and cosmological constants.
  • To explore the role of bulk geometry and black hole mass in these variations.

Main Methods:

  • Derivation of cosmological evolution equations.
  • Analysis of bulk geometry.
  • Study of the coupling between curvature terms and matter.

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Main Results:

  • The governing equations resemble Randall-Sundrum scenarios but feature time-varying constants.
  • Bulk curvature terms, related to black hole mass, drive the variation in constants.
  • A coupling between curvature terms and matter is identified.

Conclusions:

  • The Gauss-Bonnet term introduces dynamic gravitational and cosmological constants in brane worlds.
  • Black hole physics in the bulk influences cosmological evolution.
  • The identified coupling may be significant for understanding the early universe.