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

Research output: Contribution to journalArticlepeer-review

  • Nicola Bartolo
  • Matteo Fasiello
  • Sabino Matarrese
  • Antonio Riotto
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 f_{NL} can be substantially larger than what dictated by the slow-roll parameters.
Original languageEnglish
Article number026
JournalJournal of Cosmology and Astroparticle Physics
Issue number12
Publication statusPublished - 29 Dec 2010

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