Loop quantum gravity and the cyclic universe

Martin Bojowald, Roy Maartens, Parampreet Singh

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Loop quantum gravity introduces strong nonperturbative modifications to the dynamical equations in the semiclassical regime, which are responsible for various novel effects, including resolution of the classical singularity in a Friedman universe. Here we investigate the modifications for the case of a cyclic universe potential, assuming that we can apply the four-dimensional loop quantum formalism within the effective four-dimensional theory of the cyclic scenario. We find that loop quantum effects can dramatically alter the near-collision dynamics of the cyclic scenario. In the kinetic-dominated collapse era, the scalar field is effectively frozen by loop quantum friction, so that the branes approach collision and bounce back without actual collision.

Original languageEnglish (US)
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number8
DOIs
StatePublished - Jan 1 2004

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universe
gravitation
collisions
friction
scalars
formalism
kinetics

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

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Loop quantum gravity and the cyclic universe. / Bojowald, Martin; Maartens, Roy; Singh, Parampreet.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 70, No. 8, 01.01.2004.

Research output: Contribution to journalArticle

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