Abstract
We study the effects of non-standard self-interactions (NSSI) of neutrinos streaming out of a core-collapse supernova. We show that with NSSI, the standard linear stability analysis gives rise to linearly as well as exponentially growing solutions. For a two-box spectrum, we demonstrate analytically that flavor-preserving NSSI lead to a suppression of bipolar collective oscillations. In the intersecting four-beam model, we show that flavor-violating NSSI can lead to fast oscillations even when the angle between the neutrino and antineutrino beams is obtuse, which is forbidden in the Standard Model. This leads to the new possibility of fast oscillations in a two-beam system with opposing neutrino-antineutrino fluxes, even in the absence of any spatial inhomogeneities. Finally, we solve the full non-linear equations of motion in the four-beam model numerically, and explore the interplay of fast and slow flavor conversions in the long-time behavior, in the presence of NSSI.
Highlights
Neutrinos exiting a core-collapse supernova (SN) can undergo rapid flavor conversions
We explore how the exponentially growing flavor conversion modes are affected by the nonstandard self-interactions (NSSI)
While the linear stability analysis in standard model (SM) leads to an eigenvalue equation, the most general EoM incorporating NSSI does not do so
Summary
Neutrinos exiting a core-collapse supernova (SN) can undergo rapid flavor conversions. Due to the differences in interaction cross sections, the nonelectron neutrinos would decouple earlier than the electron neutrinos and would have a more forward peaked zenith angle distribution [26] These conversions can take place at a radius of r ∼ Oð10Þ km [25]. We start by performing a linear stability analysis in the two-neutrino flavor space to analytically understand the effects of NSSI on the onset of collective oscillation. Such an analysis typically leads to an eigenvalue equation [19], whose exponentially growing eigenvalues correspond to an instability, and indicate the onset.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
