Nonstandard neutrino-neutrino refractive effects in dense neutrino gases

Mattias Blennow, Alessandro Mirizzi, and Pasquale D. Serpico
Phys. Rev. D 78, 113004 – Published 10 December 2008

Abstract

We investigate the effects of nonstandard four-fermion neutrino-neutrino interactions on the flavor evolution of dense neutrino gases. We find that in the regions where the neutrino-neutrino refractive index leads to collective flavor oscillations, the presence of new neutrino interactions can produce flavor equilibration in both normal and inverted neutrino mass hierarchy. In realistic supernova environments, these effects are significant if the nonstandard neutrino-neutrino interaction strength is comparable to the one expected in the standard case, dominating the ordinary matter potential. However, very small nonstandard neutrino-neutrino couplings are enough to trigger the usual collective neutrino flavor transformations in the inverted neutrino mass hierarchy, even if the mixing angle vanishes exactly.

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  • Received 21 October 2008

DOI:https://doi.org/10.1103/PhysRevD.78.113004

©2008 American Physical Society

Authors & Affiliations

Mattias Blennow* and Alessandro Mirizzi

  • Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München, Germany

Pasquale D. Serpico

  • Physics Department, Theory Division, CERN, CH-1211 Geneva 23, Switzerland and Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500 USA

  • *blennow@mppmu.mpg.de
  • amirizzi@mppmu.mpg.de
  • serpico@cern.ch

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Issue

Vol. 78, Iss. 11 — 1 December 2008

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