Instability of periodic waves in generalized Korteweg-de Vries-Burgers equation with monostable source

We study periodic traveling waves in a general class of nonlinear dispersive equations with Burgers dissipation and a monostable Fisher-KPP reaction source.

Under natural assumptions on the dispersion symbol, we prove the existence of small-amplitude periodic traveling waves bifurcating from a constant equilibrium by means of a Lyapunov-Schmidt reduction.

We then investigate the spectral stability of these waves by combining Floquet-Bloch decomposition with perturbation theory for linear operators.

It is shown that the Floquet spectrum of the linearized operator intersects the unstable complex half-plane, implying spectral instability with respect to localized perturbations.

The results recover the recently established instability theory for the Korteweg-de Vries-Burgers-Fisher equation as a special case and provide a unified framework for a broad class of local and nonlocal dispersive systems.

These results reveal a common instability mechanism generated by the interplay of dispersion, Burgers dissipation, and monostable reaction dynamics.