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Cyclic cosmology, conformal symmetry and the metastability of the Higgs

Bars, Itzhak and Steinhardt, Paul J. and Turok, Neil (2013) Cyclic cosmology, conformal symmetry and the metastability of the Higgs. Physics Letters B, 726 (1-3). pp. 50-55. ISSN 0370-2693. doi:10.1016/j.physletb.2013.08.071.

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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.

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Additional Information:© 2013 Elsevier B.V. Received 31 July 2013; Received in revised form 23 August 2013; Accepted 26 August 2013; Available online 2 September 2013. We thank A. Ijjas for comments on the manuscript. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Research and Innovation. This research was partially supported by the U.S. Department of Energy under grant number DE-FG03-84ER40168 (I.B.) and under grant number DE-FG02-91ER40671 (P.J.S.).
Funding AgencyGrant Number
Government of CanadaUNSPECIFIED
Industry CanadaUNSPECIFIED
Province of Ontario Ministry of Research and InnovationUNSPECIFIED
Department of Energy (DOE)DE-FG03-84ER40168
Department of Energy (DOE)DE-FG02-91ER40671
Issue or Number:1-3
Record Number:CaltechAUTHORS:20140207-130748560
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Official Citation:Itzhak Bars, Paul J. Steinhardt, Neil Turok, Cyclic cosmology, conformal symmetry and the metastability of the Higgs, Physics Letters B, Volume 726, Issues 1–3, 7 October 2013, Pages 50-55, ISSN 0370-2693, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43727
Deposited By: Tony Diaz
Deposited On:12 Feb 2014 21:53
Last Modified:10 Nov 2021 16:42

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