Computation and Stability of Traveling Waves in Second Order Evolution Equations
Provides a rigorous theoretical foundation for computing traveling waves in second-order evolution equations, which is a methodological advance for applied mathematicians studying wave phenomena.
The paper extends the freezing method to second-order wave equations to compute traveling waves and their speeds, proving convergence under spectral conditions and small perturbations. Numerical examples for Nagumo and FitzHugh-Nagumo systems illustrate the theory.
The topic of this paper are nonlinear traveling waves occuring in a system of damped waves equations in one space variable. We extend the freezing method from first to second order equations in time. When applied to a Cauchy problem, this method generates a comoving frame in which the solution becomes stationary. In addition it generates an algebraic variable which converges to the speed of the wave, provided the original wave satisfies certain spectral conditions and initial perturbations are sufficiently small. We develop a rigorous theory for this effect by recourse to some recent nonlinear stability results for waves in first order hyperbolic systems. Numerical computations illustrate the theory for examples of Nagumo and FitzHugh-Nagumo type.