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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...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
2016
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2017.01.042 http://cds.cern.ch/record/2232097 |
_version_ | 1780952666020511744 |
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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 |
record_format | invenio |
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 |