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Title: Light sterile neutrinos and inflationary freedom

Abstract

We perform a cosmological analysis in which we allow the primordial power spectrum of scalar perturbations to assume a shape that is different from the usual power-law predicted by the simplest models of cosmological inflation. We parameterize the free primordial power spectrum with a ''piecewise cubic Hermite interpolating polynomial'' (PCHIP). We consider a 3+1 neutrino mixing model with a sterile neutrino having a mass at the eV scale, which can explain the anomalies observed in short-baseline neutrino oscillation experiments. We find that the freedom of the primordial power spectrum allows to reconcile the cosmological data with a fully thermalized sterile neutrino in the early Universe. Moreover, the cosmological analysis gives us some information on the shape of the primordial power spectrum, which presents a feature around the wavenumber k=0.002 Mpc{sup −1}.

Authors:
 [1];  [2];  [3]
  1. Department of Physics, University of Torino, Via P. Giuria 1, I–10125 Torino (Italy)
  2. INFN, Sezione di Torino, Via P. Giuria 1, I–10125 Torino (Italy)
  3. Dipartimento di Fisica e Astronomia ''G. Galilei'', Università di Padova, and INFN, Sezione di Padova, Via F. Marzolo 8, I–35131 Padova (Italy)
Publication Date:
OSTI Identifier:
22525894
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; COSMOLOGY; DISTURBANCES; ENERGY SPECTRA; MASS; NEUTRINO OSCILLATION; NEUTRINOS; POLYNOMIALS; SCALARS; UNIVERSE; VISIBLE RADIATION

Citation Formats

Gariazzo, S., Giunti, C., and Laveder, M., E-mail: gariazzo@to.infn.it, E-mail: giunti@to.infn.it, E-mail: laveder@pd.infn.it. Light sterile neutrinos and inflationary freedom. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/04/023.
Gariazzo, S., Giunti, C., & Laveder, M., E-mail: gariazzo@to.infn.it, E-mail: giunti@to.infn.it, E-mail: laveder@pd.infn.it. Light sterile neutrinos and inflationary freedom. United States. doi:10.1088/1475-7516/2015/04/023.
Gariazzo, S., Giunti, C., and Laveder, M., E-mail: gariazzo@to.infn.it, E-mail: giunti@to.infn.it, E-mail: laveder@pd.infn.it. Wed . "Light sterile neutrinos and inflationary freedom". United States. doi:10.1088/1475-7516/2015/04/023.
@article{osti_22525894,
title = {Light sterile neutrinos and inflationary freedom},
author = {Gariazzo, S. and Giunti, C. and Laveder, M., E-mail: gariazzo@to.infn.it, E-mail: giunti@to.infn.it, E-mail: laveder@pd.infn.it},
abstractNote = {We perform a cosmological analysis in which we allow the primordial power spectrum of scalar perturbations to assume a shape that is different from the usual power-law predicted by the simplest models of cosmological inflation. We parameterize the free primordial power spectrum with a ''piecewise cubic Hermite interpolating polynomial'' (PCHIP). We consider a 3+1 neutrino mixing model with a sterile neutrino having a mass at the eV scale, which can explain the anomalies observed in short-baseline neutrino oscillation experiments. We find that the freedom of the primordial power spectrum allows to reconcile the cosmological data with a fully thermalized sterile neutrino in the early Universe. Moreover, the cosmological analysis gives us some information on the shape of the primordial power spectrum, which presents a feature around the wavenumber k=0.002 Mpc{sup −1}.},
doi = {10.1088/1475-7516/2015/04/023},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2015,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}