CMB non-gaussianity from vector fields

Marco Peloso

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Planck satellite has recently measured the CMB temperature anisotropies with unprecedented accuracy, and it has provided strong bounds on primordial non-gaussianity. Such bounds constrain models of inflation, and mechanisms that produce the primordial perturbations. We discuss the non-gaussian signatures from the interactions of the inflation φ with spin-1 fields. We study the two different cases in which the inflaton is (i) a pseudo-scalar field with a φfa interaction with a vector field, and (ii) a scalar field with a f (φ)F2 interaction. In the first case we obtain the strong limit fa≳1016GeV on the decay constant. In the second case, specific choices of the function f (φ) can lead to a non-gaussianity with a characteristic shape not encountered in standard models of scalar field inflation, and which has also been constrained by Planck.

Original languageEnglish (US)
Title of host publicationWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 - 7th International Conference on Interconnections between Particle Physics and Cosmology, PPC* 2013
PublisherAmerican Institute of Physics Inc.
Pages429-435
Number of pages7
Volume1604
ISBN (Print)9780735412385
DOIs
StatePublished - Jan 1 2014
EventWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013 - Lead/Deadwood, SD, United States
Duration: Jun 24 2013Jul 26 2013

Other

OtherWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013
CountryUnited States
CityLead/Deadwood, SD
Period6/24/137/26/13

Keywords

  • Inflation
  • Non-Gaussianity
  • Planck

Fingerprint Dive into the research topics of 'CMB non-gaussianity from vector fields'. Together they form a unique fingerprint.

Cite this