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Antigravity and the big crunch/big bang transition

Author(s): Bars, Itzhak; Chen, Shih-Hung; Steinhardt, Paul J.; Turok, Neil

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dc.contributor.authorBars, Itzhak-
dc.contributor.authorChen, Shih-Hung-
dc.contributor.authorSteinhardt, Paul J.-
dc.contributor.authorTurok, Neil-
dc.identifier.citationBars, Itzhak, Chen, Shih-Hung, Steinhardt, Paul J, Turok, Neil. (2012). Antigravity and the big crunch/big bang transition. PHYSICS LETTERS B, 715 (278 - 281). doi:10.1016/j.physletb.2012.07.071en_US
dc.description.abstractWe 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. (c) 2012 Elsevier B.V. All rights reserved.en_US
dc.format.extent278 - 281en_US
dc.relation.ispartofPHYSICS LETTERS Ben_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleAntigravity and the big crunch/big bang transitionen_US
dc.typeJournal Articleen_US

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