Impact of sterile neutrinos on the early time flux from a galactic supernova

Author(s)

Esmaili, Arman ; Peres, O. L. G. ; Serpico, Pasquale Dario

• Document type: Journal article
• Source: Physical Review D; v. 90, n. 3, p. 20-pg., 2014-08-20.

Abstract

We study the impact of the existence of an eV-mass scale sterile neutrino-with parameters in the ballpark of what is required to fit the laboratory anomalies-on the early time profile of the electron neutrino and antineutrino fluxes associated to a core-collapse supernova (SN). In particular, we focus on the universal feature of neutronization burst expected in the first tens of ms of the signal: Provided that a detector with sufficient sensitivity is available, it is well known that in the three-neutrino framework the detection of the neutronization burst in neutrino channel would signal inverted mass hierarchy. This conclusion is dramatically altered in the presence of a sterile neutrino: We study here, both analytically and numerically, the region in parameter space where this characteristic signal disappears, mimicking normal hierarchy expectations. Conversely, the detection of a peak consistent with expectations for inverted mass hierarchy would exclude the existence of a sterile state over a much wider parameter space than what is required by laboratory anomaly fits, or is even probed by detectors coming on-line in the near future. Additionally, we show the peculiar alteration in the energy-time double differential flux, with a delayed peak appearing for kinematical reasons, which might offer a remarkable signature in the case of favorable parameters and for a high statistics detection of a Galactic SN. We also comment on additional potentially interesting effects in the electron antineutrino channel, if more than one angle in the active-sterile sector is nonvanishing. As an ancillary result that we derived in the technical resolution of the equations, in an Appendix we report the Cayley-Hamilton formalism for the evolution of a four-neutrino system in matter, generalizing existing results in the literature. (AU)

• FAPESP's process: 09/17924-5 - Neutrino phenomenology in neutrino telescopes
• Grantee: Arman Esmaili Taklimi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 12/08208-7 - Astroparticle tests of beyond standard model light degrees of freedom
• Grantee: Orlando Luis Goulart Peres
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• FAPESP's process: 12/16389-1 - Neutrino phenomenology
• Grantee: Orlando Luis Goulart Peres
• Support Opportunities: Regular Research Grants