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000627000 1001_ $$0P:(DE-H253)PIP1111196$$aFiorillo, Damiano Francesco Giuseppe$$b0$$eCollaboration author
000627000 245__ $$aFast flavor pendulum: Instability condition
000627000 260__ $$aRidge, NY$$bAmerican Physical Society$$c2025
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000627000 500__ $$aPhys.Rev.D. 111 (2025) 8, 083028. 17 pages, 7 figures. Matches version published in Phys. Rev. D
000627000 520__ $$aEven in the absence of neutrino masses, a neutrino gas can exhibit a homogeneous flavor instability that leads to a periodic motion known as the fast flavor pendulum. A well-known necessary condition is a crossing of the angular flavor lepton distribution. In an earlier work, some of us showed that homogeneous flavor instabilities also obey a Nyquist criterion, inspired by plasma physics. This condition, while more restrictive than the angular crossing, is only sufficient if the unstable branch of the dispersion relation is bounded by critical points that both lie under the light cone (points with subluminal phase velocity). While the lepton-number angle distribution, assumed to be axially symmetric, easily allows one to determine the real-valued branch of the dispersion relation and to recognize if instead superluminal critical points exist, this graphical method does not translate into a simple instability condition. We discuss the homogeneous mode in the more general context of the dispersion relation for modes with arbitrary wave number and stress that it plays no special role on this continuum, except for its regular but fragile long-term behavior, owed to its many symmetries.
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000627000 7001_ $$00009-0001-0518-9274$$aGoimil-García, Manuel$$b1
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000627000 7870_ $$0PUBDB-2025-01244$$aFiorillo, Damiano F. G. et.al.$$d2024$$iIsParent$$rarXiv:2412.09027$$tFast Flavor Pendulum: Instability Condition
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