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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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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. (c) 2012 Elsevier B.V. All rights reserved.
Publication Date: 29-Aug-2012
Electronic Publication Date: 1-Aug-2012
Citation: Bars, 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.2012.07.071
DOI: doi:10.1016/j.physletb.2012.07.071
ISSN: 0370-2693
Pages: 278 - 281
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICS LETTERS B
Version: Final published version. This is an open access article.

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