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http://hdl.handle.net/2445/144887
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DC Field | Value | Language |
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dc.contributor.author | Ferreira, Ricardo Z. | - |
dc.contributor.author | Notari, Alessio | - |
dc.date.accessioned | 2019-11-14T16:29:30Z | - |
dc.date.available | 2019-11-14T16:29:30Z | - |
dc.date.issued | 2018-03-29 | - |
dc.identifier.issn | 2470-0010 | - |
dc.identifier.uri | http://hdl.handle.net/2445/144887 | - |
dc.description.abstract | A safe way to reheat the Universe, in models of natural and quadratic inflation, is through shift symmetric couplings between the inflaton ϕ and the Standard Model (SM), since they do not generate loop corrections to the potential V ( ϕ ) . We consider such a coupling to SM gauge fields, of the form ϕ F F / f , with sub-Planckian f . In this case, gauge fields can be exponentially produced already during inflation and thermalize via interactions with charged particles, as pointed out in previous work. This can lead to a plasma of temperature T during inflation, and the thermal masses g T of the gauge bosons can equilibrate the system. In addition, inflaton perturbations δ ϕ can also have a thermal spectrum if they have sufficiently large cross sections with the plasma. In this case, inflationary predictions are strongly modified: (1) scalar perturbations are thermal, and so enhanced over the vacuum, leading to a generic way to suppress the tensor-to-scalar ratio r ; (2) the spectral index is n s − 1 = η − 4 ε . After presenting the relevant conditions for thermalization, we show that thermalized natural and monomial models of inflation agree with present observations and have r ≈ 10 − 3 − 10 − 2 , which is within reach of next generation CMB experiments. | - |
dc.format.extent | 6 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.97.063528 | - |
dc.relation.ispartof | Physical Review D, 2018, vol. 97, num. 6, p. 063528 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.97.063528 | - |
dc.rights | (c) American Physical Society, 2018 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Cosmologia | - |
dc.subject.classification | Gravitació | - |
dc.subject.other | Cosmology | - |
dc.subject.other | Gravitation | - |
dc.title | Thermalized axion inflation: Natural and monomial inflation with small r | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 688441 | - |
dc.date.updated | 2019-11-14T16:29:30Z | - |
dc.relation.projectID | info:eu-repo/grantAgreement/EC/FP7/306605/EU//HOLOLHC | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
Files in This Item:
File | Description | Size | Format | |
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688441.pdf | 3.28 MB | Adobe PDF | View/Open |
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