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The dynamics of modulated wave trains by Arjen Doelman, Bjorn Sandstede, Arnd Scheel, Guido Schneider

By Arjen Doelman, Bjorn Sandstede, Arnd Scheel, Guido Schneider

The authors of this identify examine the dynamics of weakly-modulated nonlinear wave trains. For reaction-diffusion structures and for the complicated Ginzburg - Landau equation, they determine carefully that slowly various modulations of wave trains are good approximated via options to the Burgers equation over the normal time scale. as well as the validity of the Burgers equation, they convey that the viscous surprise profiles within the Burgers equation for the wave quantity are available as actual modulated waves within the underlying reaction-diffusion method. In different phrases, they identify the life and balance of waves which are time-periodic in properly relocating coordinate frames which separate areas in actual house which are occupied by way of wave trains of alternative, yet virtually exact, wave quantity. the rate of those shocks is dependent upon the Rankine - Hugoniot situation the place the flux is given via the nonlinear dispersion relation of the wave trains. the crowd velocities of the wave trains in a body relocating with the interface are directed towards the interface. utilizing pulse-interaction idea, the authors additionally give some thought to related surprise profiles for wave trains with huge wave quantity, that's, for an enormous series of generally separated pulses. the consequences offered listed below are utilized to the FitzHugh - Nagumo equation and to hydrodynamic balance difficulties

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29) ∂t v c ∂t v s = λc v c + ρN c (v c , v s ) = Λs v s + N s (v c , v s ), which we shall solve for (v c , v s ) where m+1 c := Hul ∩Rg(pc |Fix P c ), v c ∈ Xm m+1 s m ∩Fix P s . v s = (r, ψ) ∈ Xm := Hul × Hul c From now on, as there is little danger of confusion, we shall denote both spaces Xm s and Xm simply by Xm . Since the variable v c has compact support in Fourier space, it lies, in fact, in s+1 s s Hul for every s ≥ 0; more precisely, we have v c f1 ∈ Hul × Hul for each s. We also record that ρ is a possibly nonlocal linear operator that acts similar to ∂x .

Fix integers M ≥ 1 and 1 ≤ m ≤ n − 3 − M and choose a constant C0 > 0. There are then constants C1 > 0 and δ1 > 0 such that the following is true. 20) sup T ∈[0,T0 ] h (W, Ψ)(·, T ) − (WM , ΨhM )(·, T ) m+1 m Hul ×Hul ≤ C1 δ M . Hence, we have an approximation result for the variables (W, Ψ) which is uniform in space. 4 are entirely due to the reconstruction of the phase φ from the wave number ψ. 5. 2. 6. 5, we need to separate the dynamics of the critical modes corresponding to marginally stable spectrum of the wave trains from the remaining damped modes.

31) are replaced by δ M +5/2 and δ M +3/2 , respectively, due to the scaling properties of L2 spaces. 34) of the nonlinear terms remain true in X˜m . 9 are true in X˜m since the δ-dependent norm in H m (n; δ) ensures that the constants arising in the estimates of the critical semigroup remain are O(1) in δ over the long time scale O(1/δ 2 ). 20) needs to be replaced by δ M −1/2 . It remains to transfer the result from wave numbers to phases. Without loss of generality, we may assume that q− = 0.

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