Employing an effective field theory approach to inflationary perturbations, we analyze in detail the effect of curvature-generated Lagrangian operators on various observables, focusing on their running with scales. At quadratic order, we solve the equation of motion at next-to-leading leading order in a generalized slow-roll approximation for a very general theory of single-field inflation. We derive the resulting power spectrum, its tilt and running. We then focus on the contribution to the primordial non-Gaussianity amplitude f NL sourced by a specific interaction term. We show that the running of fNL can be substantially larger than what dictated by the slow-roll parameters. © 2010 IOP Publishing Ltd and SISSA.

Bartolo, N., Fasiello, M., Matarrese, S., Riotto, A. (2010). Tilt and running of cosmological observables in generalized single-field inflation. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2010(12) [10.1088/1475-7516/2010/12/026].

Tilt and running of cosmological observables in generalized single-field inflation

FASIELLO, MATTEO RAFFAELE;
2010

Abstract

Employing an effective field theory approach to inflationary perturbations, we analyze in detail the effect of curvature-generated Lagrangian operators on various observables, focusing on their running with scales. At quadratic order, we solve the equation of motion at next-to-leading leading order in a generalized slow-roll approximation for a very general theory of single-field inflation. We derive the resulting power spectrum, its tilt and running. We then focus on the contribution to the primordial non-Gaussianity amplitude f NL sourced by a specific interaction term. We show that the running of fNL can be substantially larger than what dictated by the slow-roll parameters. © 2010 IOP Publishing Ltd and SISSA.
Articolo in rivista - Articolo scientifico
Cosmological perturbation theory; Inflation; Non-Gaussianity;
English
2010
2010
12
026
none
Bartolo, N., Fasiello, M., Matarrese, S., Riotto, A. (2010). Tilt and running of cosmological observables in generalized single-field inflation. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2010(12) [10.1088/1475-7516/2010/12/026].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/48147
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