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Cyclic cosmology, conformal symmetry and the metastability of the Higgs

Author(s): Bars, Itzhak; Steinhardt, Paul J.; Turok, Neil

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Abstract: Recent measurements at the LHC suggest that the current Higgs vacuum could be metastable with a modest barrier (height (10(10-12) GeV)(4)) separating it from a ground state with negative vacuum density of order the Planck scale. We note that metastability is problematic for standard bang cosmology but is essential for cyclic cosmology in order to end one cycle, bounce, and begin the next. In this Letter, motivated by the approximate scaling symmetry of the standard model of particle physics and the primordial large-scale structure of the universe, we use our recent formulation of the Weyl-invariant version of the standard model coupled to gravity to track the evolution of the Higgs in a regularly bouncing cosmology. We find a band of solutions in which the Higgs field escapes from the metastable phase during each big crunch, passes through the bang into an expanding phase, and returns to the metastable vacuum, cycle after cycle after cycle. We show that, due to the effect of the Higgs, the infinitely cycling universe is geodesically complete, in contrast to inflation. (C) 2013 Elsevier B.V. All rights reserved.
Publication Date: 7-Oct-2013
Electronic Publication Date: 2-Sep-2013
Citation: Bars, Itzhak, Steinhardt, Paul J, Turok, Neil. (2013). Cyclic cosmology, conformal symmetry and the metastability of the Higgs. PHYSICS LETTERS B, 726 (50 - 55. doi:10.1016/j.physletb.2013.08.071
DOI: doi:10.1016/j.physletb.2013.08.071
ISSN: 0370-2693
EISSN: 1873-2445
Pages: 50 - 55
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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