Antigravity and the big crunch/big bang transition

Itzhak Bars, Shih Hung Chen, Paul J. Steinhardt, Neil Turok

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

We point out a new phenomenon which seems to be generic in 4d effective theories of scalar fields coupled to Einstein gravity, when applied to cosmology. A lift of such theories to a Weyl-invariant extension allows one to define classical evolution through cosmological singularities unambiguously, and hence construct geodesically complete background spacetimes. An attractor mechanism ensures that, at the level of the effective theory, generic solutions undergo a big crunch/big bang transition by contracting to zero size, passing through a brief antigravity phase, shrinking to zero size again, and re-emerging into an expanding normal gravity phase. The result may be useful for the construction of complete bouncing cosmologies like the cyclic model.

Original languageEnglish (US)
Pages (from-to)278-281
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume715
Issue number1-3
DOIs
StatePublished - Aug 29 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Keywords

  • 2T-physics
  • Big bang
  • Big crunch
  • Cyclic cosmology
  • General relativity
  • Weyl symmetry

Fingerprint Dive into the research topics of 'Antigravity and the big crunch/big bang transition'. Together they form a unique fingerprint.

  • Cite this