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Cosmological consequences of dilatons in the electroweak model

McDonald, John (1992) Cosmological consequences of dilatons in the electroweak model. Physics Letters B, 274 (1). pp. 72-78. ISSN 0370-2693

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Abstract

We consider the cosmological evolution of an electroweak model with a Jordan-Brans-Dicke dilaton, as would result from spontaneously breaking scale-invariance in a complete theory. For the case where the Friedman-Robertson-Walker (FRW) metric is introduced in the Einstein frame, it is shown that the phase transition is first-order, in agreement with previous treatments of this question. It is however argued that the treatment given here is more physically correct than previous treatments. It is also shown that at the electroweak phase transition, which occurs at the temperature of chiral symmetry breaking, most of the vacuum energy goes into oscillations of the dilaton field, with essentially no reheating or increase in entropy. As a result, the universe becomes effectively matter dominated before nucleosynthesis, ruling out the model. The only way to avoid this problem is to have scale-invariance broken at less than O(10(7)) GeV. For the case where the FRW metric is introduced in the Jordan frame, the electroweak phase transition is of second-order as for the minimal standard model. The question of the energy density in dilatons is dependent upon the assumed form of the dilaton potential.

Item Type: Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: INFLATION
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 83249
Deposited By: ep_importer_pure
Deposited On: 29 Nov 2016 09:00
Refereed?: Yes
Published?: Published
Last Modified: 20 Sep 2017 03:15
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/83249

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