Instability diagram of the massive gauge quantum fields around the nonlinear massive classical wave solution

Yoshio Kitadono; Tomohiro Inagaki

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arXiv · 2608.19855

Instability diagram of the massive gauge quantum fields around the nonlinear massive classical wave solution

Yoshio Kitadono·Tomohiro Inagaki

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Abstract

The stability and instability in the time dynamics of quantum fluctuation of the massive gauge field coupling to the nonlinear massive wave solution is studied. In particular, the instability in the transverse polarization and longitudinal polarization modes are obtained as the two dimensional plot of the initial field value parameter and the spatial momentum of the quantum massive gauge fields with the help of the theory of the Hill's equation. We present the formalism to analyze the massive gauge field by taking into account Proca constraint and we found that our formalism can predict the time dynamics of the unstable quantum mode by the Floquet index. The resulting polarization-resolved Floquet maps show that the transverse modes possess only narrow parametric-resonance bands, whereas the longitudinal modes exhibit substantially broader regions generated by both parametric and spinodal instabilities. We also find additional low-momentum instability regions for the $W$ boson that are absent or strongly suppressed in the $Z$ sector.

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Yoshio Kitadono, Tomohiro Inagaki. 2026-08-20. Instability diagram of the massive gauge quantum fields around the nonlinear massive classical wave solution. https://arxiv.org/abs/2608.19855

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