English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We demonstrate that in the presence of (pseudo)scalar four-fermionnonstandard interactions, a homogeneous and isotropic gas of Majorana neutrinosplaced in a strong magnetic field can exhibit an angular flavor instabilitymixing the two neutrino helicities (i.e., a `neutrino-antineutrino'instability). This instability is most pronounced for the inverted masshierarchy and high neutrino number densities; at the same time, even a tinytransition magnetic moment of the order of $10^{-24}\mu_{\text{B}}$ is quitesufficient to trigger it. We study the properties of the neutrino-antineutrinomode using the linear stability analysis and then perform a numericalsimulation to analyze the late-time properties of an oscillating neutrino gaswith V-A and (pseudo)scalar interactions. The latter analysis reveals threephases of a chaotic, `thermalized' late-time state of neutrinos: along with alow-density phase with the SO(3) symmetry broken by V-A interactions and asymmetric high-density phase, another, (pseudo)scalar-induced phase with abroken rotational symmetry appears. The phases can be distinguished by theaverage late-time probabilities of (anti)neutrino flavors and/or by theneutrino-to-antineutrino ratio, the latter being a key quantity for the(pseudo)scalar phase. We thus show that observations of these quantities from asupernova could place new constraints on the (pseudo)scalar nonstandardneutrino interactions.

Angular instabilities of a homogeneous neutrino gas from (pseudo)scalar nonstandard self-interactions