Bouncing universes in string-inspired gravity

Aug, 2005
28 pages
Published in:
  • JCAP 03 (2006) 009
e-Print:
Report number:
  • YITP-SB-05-23,
  • NORDITA-2005-53

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Abstract:
We consider the effects on cosmology of higher-derivative modifications of (effective) gravity that make it asymptotically free without introducing ghosts. The weakening of gravity at short distances allows pressure to prevent the singularity, producing a solution with contraction preceding expansion.
  • cosmology
  • string
  • quantum gravity
  • string model
  • effective action
  • gravitation: action
  • derivative: high
  • ghost
  • asymptotic freedom
  • field equations: solution
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