Pseudoscalar - sterile neutrino interactions: reconciling the cosmos with neutrino oscillations

Maria Archidiacono, Stefano Gariazzo, Carlo Giunti, Steen Hannestad, Rasmus Hansen, Marco Laveder, Thomas Tram

Research output: Contribution to journalArticlepeer-review

81 Downloads (Pure)


The Short BaseLine (SBL) neutrino oscillation anomalies hint at the presence of a sterile neutrino with a mass of around 1eV. However, such a neutrino is incompatible with cosmological data, in particular observations of the Cosmic Microwave Background (CMB) anisotropies. However, this conclusion can change by invoking new physics. One possibility is to introduce a secret interaction in the sterile neutrino sector mediated by a light pseudoscalar. In this pseudoscalar model, CMB data prefer a sterile neutrino mass that is fully compatible with the mass ranges suggested by SBL anomalies. In addition, this model predicts a value of the Hubble parameter which is completely consistent with local measurements.

Original languageEnglish
Article number067
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
Publication statusPublished - 30 Aug 2016


  • Cosmological parameters from CMBR
  • Neutrino masses from cosmology
  • Neutrino properties
  • Particle physics - cosmology connection


Dive into the research topics of 'Pseudoscalar - sterile neutrino interactions: reconciling the cosmos with neutrino oscillations'. Together they form a unique fingerprint.

Cite this