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Clockwork Inflation

We investigate the recently proposed clockwork mechanism delivering light degrees of freedom with suppressed interactions and show, with various examples, that it can be efficiently implemented in inflationary scenarios to generate flat inflaton potentials and small density perturbations without fin...

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Detalles Bibliográficos
Autores principales: Kehagias, Alex, Riotto, Antonio
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2017.01.042
http://cds.cern.ch/record/2232097
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author Kehagias, Alex
Riotto, Antonio
author_facet Kehagias, Alex
Riotto, Antonio
author_sort Kehagias, Alex
collection CERN
description We investigate the recently proposed clockwork mechanism delivering light degrees of freedom with suppressed interactions and show, with various examples, that it can be efficiently implemented in inflationary scenarios to generate flat inflaton potentials and small density perturbations without fine-tunings. We also study the clockwork graviton in de Sitter and, interestingly, we find that the corresponding clockwork charge is site-dependent. As a consequence, the amount of tensor modes is generically suppressed with respect to the standard cases where the clockwork set-up is not adopted. This point can be made a virtue in resurrecting models of inflation which were supposed to be ruled out because of the excessive amount of tensor modes from inflation.
id cern-2232097
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
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spelling cern-22320972022-08-10T12:35:23Zdoi:10.1016/j.physletb.2017.01.042http://cds.cern.ch/record/2232097engKehagias, AlexRiotto, AntonioClockwork Inflationhep-thParticle Physics - Theorygr-qcGeneral Relativity and Cosmologyastro-ph.COAstrophysics and Astronomyhep-phParticle Physics - PhenomenologyWe investigate the recently proposed clockwork mechanism delivering light degrees of freedom with suppressed interactions and show, with various examples, that it can be efficiently implemented in inflationary scenarios to generate flat inflaton potentials and small density perturbations without fine-tunings. We also study the clockwork graviton in de Sitter and, interestingly, we find that the corresponding clockwork charge is site-dependent. As a consequence, the amount of tensor modes is generically suppressed with respect to the standard cases where the clockwork set-up is not adopted. This point can be made a virtue in resurrecting models of inflation which were supposed to be ruled out because of the excessive amount of tensor modes from inflation.arXiv:1611.03316oai:cds.cern.ch:22320972016-11-10
spellingShingle hep-th
Particle Physics - Theory
gr-qc
General Relativity and Cosmology
astro-ph.CO
Astrophysics and Astronomy
hep-ph
Particle Physics - Phenomenology
Kehagias, Alex
Riotto, Antonio
Clockwork Inflation
title Clockwork Inflation
title_full Clockwork Inflation
title_fullStr Clockwork Inflation
title_full_unstemmed Clockwork Inflation
title_short Clockwork Inflation
title_sort clockwork inflation
topic hep-th
Particle Physics - Theory
gr-qc
General Relativity and Cosmology
astro-ph.CO
Astrophysics and Astronomy
hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.physletb.2017.01.042
http://cds.cern.ch/record/2232097
work_keys_str_mv AT kehagiasalex clockworkinflation
AT riottoantonio clockworkinflation