New effects of non-standard self-interactions of neutrinos in a supernova

Journal Article · Mon May 01 04:00:00 EDT 2017 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2017/05/051· OSTI ID:22676185

Das, Anirban; Dighe, Amol; Sen, Manibrata ^[1]

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1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005 (India)

Neutrino self-interactions are known to lead to non-linear collective flavor oscillations in a core-collapse supernova. We point out new possible effects of non-standard self-interactions (NSSI) of neutrinos on flavor conversions in a two-flavor framework. We show that, for a single-energy neutrino-antineutrino ensemble, a flavor instability is generated even in normal hierarchy for large enough NSSI. Using a toy model for the neutrino spectra, we show that flavor-preserving NSSI lead to pinching of spectral swaps, while flavor-violating NSSI cause swaps to develop away from a spectral crossing or even in the absence of a spectral crossing. Consequently, NSSI could give rise to collective oscillations and spectral splits even during neutronization burst, for both hierarchies.

• OSTI ID: 22676185
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 05 Vol. 2017; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANTINEUTRINOS
CONVERSION
FLAVOR MODEL
INSTABILITY
INTERACTIONS
NONLINEAR PROBLEMS
OSCILLATIONS
SPECTRA
SUPERNOVAE