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Primordial perturbations from dilaton-induced gauge fields

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dc.contributor.authorKiwoon Choi-
dc.contributor.authorChoi, K.-Y.-
dc.contributor.authorKim, H.-
dc.contributor.authorShin, C.S.-
dc.date.available2016-01-07T09:10:40Z-
dc.date.created2015-12-21-
dc.date.issued2015-10-
dc.identifier.issn1475-7516-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/1871-
dc.description.abstractWe study the primordial scalar and tensor perturbations in inflation scenario involving a spectator dilaton field. In our setup, the rolling spectator dilaton causes a tachyonic instability of gauge fields, leading to a copious production of gauge fields in the superhorizon regime, which generates additional scalar and tensor perturbations through gravitational interactions. Our prime concern is the possibility to enhance the tensor-to-scalar ratio r relative to the standard result, while satisfying the observational constraints. To this end, we allow the dilaton field to be stabilized before the end of inflation, but after the CMB scales exit the horizon. We show that for the inflaton slow roll parameter 10-3, the tensor-to-scalar ratio in our setup can be enhanced only by a factor of (1) compared to the standard result. On the other hand, for smaller corresponding to a lower inflation energy scale, a much bigger enhancement can be achieved, so that our setup can give rise to an observably large r 10-2 even when 10-3. The tensor perturbation sourced by the spectator dilaton can have a strong scale dependence, and is generically red-tilted. We also discuss a specific model to realize our scenario, and identify the parameter region giving an observably large r for relatively low inflation energy scales. © 2015 IOP Publishing Ltd and Sissa Medialab srl-
dc.language영어-
dc.publisherIOP PUBLISHING LTD-
dc.titlePrimordial perturbations from dilaton-induced gauge fields-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000365804000047-
dc.identifier.scopusid2-s2.0-84946750575-
dc.identifier.rimsid21776ko
dc.date.tcdate2018-10-01-
dc.contributor.affiliatedAuthorKiwoon Choi-
dc.identifier.doi10.1088/1475-7516/2015/10/046-
dc.identifier.bibliographicCitationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2015, no.10, pp.046-
dc.relation.isPartOfJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS-
dc.citation.titleJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS-
dc.citation.volume2015-
dc.citation.number10-
dc.citation.startPage046-
dc.date.scptcdate2018-10-01-
dc.description.wostc7-
dc.description.scptc8-
dc.description.journalClass1-
dc.description.journalClass1-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.relation.journalWebOfScienceCategoryAstronomy & Astrophysics-
dc.relation.journalWebOfScienceCategoryPhysics, Particles & Fields-
dc.subject.keywordPlusINFLATION-
dc.subject.keywordAuthorcosmological perturbation theory-
dc.subject.keywordAuthorinflation-
dc.subject.keywordAuthorparticle physics - cosmology connection-
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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