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Observational constraints on monomial warm inflation
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE10691 Stockholm, Sweden.
2016 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 2016, no 7, article id 054Article in journal (Refereed) Published
Abstract [en]

Warm inflation is, as of today, one of the best motivated mechanisms for explaining an early inflationary period. In this paper, we derive and analyze the current bounds on warm inflation with a monomial potential U ∝ φp, using the constraints from the PLANCK mission. In particular, we discuss the parameter space of the tensor-to-scalar ratio r and the potential coupling λ of the monomial warm inflation in terms of the number of e-folds. We obtain that the theoretical tensor-to-scalar ratio r ∼ 10-8 is much smaller than the current observational constrain r ≲ 0.12, despite a relatively large value of the field excursion Δ φ ∼ 0.1MPl. Warm inflation thus eludes the Lyth bound set on the tensor-to-scalar ratio by the field excursion.

Place, publisher, year, edition, pages
Institute of Physics Publishing , 2016. Vol. 2016, no 7, article id 054
Keywords [en]
inflation, particle physics - cosmology connection
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-207559DOI: 10.1088/1475-7516/2016/07/054ISI: 000381830000055Scopus ID: 2-s2.0-85012865034OAI: oai:DiVA.org:kth-207559DiVA, id: diva2:1103301
Note

Export Date: 22 May 2017; Article; Correspondence Address: Visinelli, L.; Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, Sweden; email: Luca.Visinelli@studio.unibo.it. QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-11-29Bibliographically approved

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