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Accelerating cosmologies from spacelike branes.

Nobuyoshi Ohta1

  • 1Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan. ohta@phys.sci.osaka-u.ac.jp

Physical Review Letters
|August 26, 2003
PubMed
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String theory and M-theory models of an accelerating universe are special cases of spacelike (S) branes. Similar accelerating universe models can be derived from S branes using hyperbolic or flat internal spaces.

Area of Science:

  • Theoretical Physics
  • Cosmology
  • String Theory

Background:

  • Recent models propose a flat, four-dimensional universe with accelerated expansion within string or M theory.
  • These models are part of broader research into cosmological solutions in higher-dimensional theories.

Purpose of the Study:

  • To identify a recently proposed accelerating universe model as a specific instance of previously discovered time-dependent solutions.
  • To explore the potential for generating similar accelerating universe models using spacelike (S) branes with different internal space geometries.

Main Methods:

  • Analysis of existing theoretical frameworks in string theory and M-theory.
  • Categorization of the proposed flat universe model as a special case of spacelike (S) brane solutions.
  • Investigation of the impact of internal space geometry (hyperbolic, flat) on cosmological models derived from S branes.

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Main Results:

  • The recently proposed flat, accelerating universe model is demonstrated to be a particular case of time-dependent S-brane solutions.
  • Accelerating universe models analogous to the proposed one can be successfully derived from S branes by utilizing hyperbolic or flat internal spaces.

Conclusions:

  • The framework of spacelike (S) branes provides a unifying perspective for certain models of cosmic acceleration in string/M-theory.
  • The geometry of the internal space in S-brane models offers flexibility in constructing diverse cosmological scenarios, including those with accelerated expansion.