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dc.contributor.author
Lopez Nacir, Diana Laura
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dc.contributor.author
Porto, Rafael A.
dc.contributor.author
Senatore, Leonardo
dc.contributor.author
Zaldarriaga, Matias
dc.date.available
2020-09-08T20:56:58Z
dc.date.issued
2012-01
dc.identifier.citation
Lopez Nacir, Diana Laura; Porto, Rafael A.; Senatore, Leonardo; Zaldarriaga, Matias; Dissipative effects in the effective field theory of inflation; Springer; Journal of High Energy Physics; 2012; 75; 1-2012; 1-75
dc.identifier.issn
1029-8479
dc.identifier.uri
http://hdl.handle.net/11336/113566
dc.description.abstract
We generalize the effective field theory of single clock inflation to include dissipative effects. Working in unitary gauge we couple a set of composite operators, Oµν..., in the effective action which is constrained solely by invariance under time-dependent spatial diffeomorphisms. We restrict ourselves to situations where the degrees of freedom responsible for dissipation do not contribute to the density perturbations at late time. The dynamics of the perturbations is then modified by the appearance of ‘friction’ and noise terms, and assuming certain locality properties for the Green’s functions of these composite operators, we show that there is a regime characterized by a large friction term γ ≫ H in which the ζ-correlators are dominated by the noise and the power spectrum can be significantly enhanced. We also compute the three point function hζζζi for a wide class of models and discuss under which circumstances large friction leads to an increased level of non-Gaussianities. In particular, under our assumptions, we show that strong dissipation together with the required non-linear realization of the symmetries implies |fNL| ∼ γ c 2 sH ≫ 1. As a paradigmatic example we work out a variation of the ‘trapped inflation’ scenario with local response functions and perform the matching with our effective theory. A detection of the generic type of signatures that result from incorporating dissipative effects during inflation, as we describe here, would teach us about the dynamics of the early universe and also extend the parameter space of inflationary models
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Cosmology of Theories beyond the SM
dc.subject
Space-Time Symmetries
dc.subject
Quantum Dissipative Systems
dc.subject.classification
Física de Partículas y Campos
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Dissipative effects in the effective field theory of inflation
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-09-08T14:03:24Z
dc.journal.volume
2012
dc.journal.number
75
dc.journal.pagination
1-75
dc.journal.pais
Italia
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dc.journal.ciudad
Trieste
dc.description.fil
Fil: Lopez Nacir, Diana Laura. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
dc.description.fil
Fil: Porto, Rafael A.. Institute For Advanced Study; Estados Unidos. Columbia University; Estados Unidos
dc.description.fil
Fil: Senatore, Leonardo. University of Stanford. Physics Department; Estados Unidos. Institute For Advanced Study; Estados Unidos
dc.description.fil
Fil: Zaldarriaga, Matias. Institute For Advanced Study; Estados Unidos
dc.journal.title
Journal of High Energy Physics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/JHEP01(2012)075
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1007/JHEP01(2012)075
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