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arXiv · 2604.18689

Flavomons in Matter Gradients: Ray Tracing and Amplitude Evolution

Damiano F. G. Fiorillo·Georg G. Raffelt
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Abstract

Flavor instabilities develop in neutrino plasmas through the emission of flavomons, the quanta of flavor waves. Matter gradients can sweep flavomons across the unstable wave-number range, halting their amplification. This effect is parametrically small for fast modes, where it was first identified, but we show that it strongly alters neutrino-mass-induced instabilities below the supernova shock, while leaving those outside largely unaffected. The role of these instabilities can therefore be established only through a global treatment beyond local dispersion relations. Using the WKB approximation, we derive the covariant evolution equation for the flavomon amplitude along geometrical-optics rays, enabling a global treatment of instability growth and seeding.

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Damiano F. G. Fiorillo, Georg G. Raffelt. 2026-04-20. Flavomons in Matter Gradients: Ray Tracing and Amplitude Evolution. https://arxiv.org/abs/2604.18689

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