@inproceedings{2530669e810d4a74993999e387076b20,
title = "CMB non-gaussianity from vector fields",
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.",
keywords = "Inflation, Non-Gaussianity, Planck",
author = "Marco Peloso",
year = "2014",
doi = "10.1063/1.4883461",
language = "English (US)",
isbn = "9780735412385",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
pages = "429--435",
booktitle = "Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 - 7th International Conference on Interconnections between Particle Physics and Cosmology, PPC* 2013",
note = "Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013 ; Conference date: 24-06-2013 Through 26-07-2013",
}