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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, OZ μ...., 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| ∼ . c2s H 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. © SISSA 2012.

Registro:

Documento: Artículo
Título:Dissipative effects in the effective field theory of inflation
Autor:Nacir, D.L.; Porto, R.A.; Senatored, L.; Zaldarriaga, M.
Filiación:Departamento de F́isica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabelĺon 1, 1428, Buenos Aires, Argentina
School of Natural Sciences, Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, United States
Department of Physics and ISCAP, Columbia University, New York, NY 10027, United States
Stanford Institute for Theoretical Physics, Stanford University, Stanford, CA 94305, United States
KIPAC, Stanford University and SLAC, Stanford, CA 94305, United States
Palabras clave:Cosmology of Theories beyond the SM; Quantum Dissipative Systems; Space-Time Symmetries
Año:2012
Volumen:2012
Número:1
DOI: http://dx.doi.org/10.1007/JHEP01(2012)075
Título revista:Journal of High Energy Physics
Título revista abreviado:J. High Energy Phys.
ISSN:11266708
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_11266708_v2012_n1_p_Nacir.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2012_n1_p_Nacir

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Citas:

---------- APA ----------
Nacir, D.L., Porto, R.A., Senatored, L. & Zaldarriaga, M. (2012) . Dissipative effects in the effective field theory of inflation. Journal of High Energy Physics, 2012(1).
http://dx.doi.org/10.1007/JHEP01(2012)075
---------- CHICAGO ----------
Nacir, D.L., Porto, R.A., Senatored, L., Zaldarriaga, M. "Dissipative effects in the effective field theory of inflation" . Journal of High Energy Physics 2012, no. 1 (2012).
http://dx.doi.org/10.1007/JHEP01(2012)075
---------- MLA ----------
Nacir, D.L., Porto, R.A., Senatored, L., Zaldarriaga, M. "Dissipative effects in the effective field theory of inflation" . Journal of High Energy Physics, vol. 2012, no. 1, 2012.
http://dx.doi.org/10.1007/JHEP01(2012)075
---------- VANCOUVER ----------
Nacir, D.L., Porto, R.A., Senatored, L., Zaldarriaga, M. Dissipative effects in the effective field theory of inflation. J. High Energy Phys. 2012;2012(1).
http://dx.doi.org/10.1007/JHEP01(2012)075