Limiting-profile conjecture for non-cooperative Fisher–KPP traveling waves

Let \boldsymbol{p}_{\eta}_{\eta>0} and c_{\eta}_{\eta\geq0} satisfy

{(η,pη,cη)Efor all η>0,c0=limη0cη.\left\{\begin{matrix}(\eta,\mathbf{p}_{\eta},c_{\eta})\in\mathscr{E}&\text{for all }\eta>0,\\ c_{0}=\lim\limits_{\eta\to0}c_{\eta}.\end{matrix}\right.

Assume (H7)(H_{7}). Stability is understood as local asymptotic stability with respect to (EKPP0)(E_{KPP}^{0}). Limiting-profile conjecture. (i) If both α1e1\alpha_{1}\mathbf{e}_{1} and α2e2\alpha_{2}\mathbf{e}_{2} are stable and cα1e1α2e20c_{\alpha_{1}\mathbf{e}_{1}\to\alpha_{2}\mathbf{e}_{2}}\neq0, then, after suitable translations, the traveling waves converge in (Cloc2(R,R2)L(R,R2))×R(\mathscr{C}_{loc}^{2}(\mathbb{R},\mathbb{R}^{2})\cap\mathscr{L}^{\infty}(\mathbb{R},\mathbb{R}^{2}))\times\mathbb{R} as η0\eta\to0 to a semi-extinct traveling wave (p0ei,c0)(p_{0}\mathbf{e}_{i},c_{0}) of (EKPP)0(E_{KPP})_{0} connecting 00 to αiei\alpha_{i}\mathbf{e}_{i}, where i=1i=1 if cα1e1α2e2>0c_{\alpha_{1}\mathbf{e}_{1}\to\alpha_{2}\mathbf{e}_{2}}>0 and i=2i=2 if cα1e1α2e2<0c_{\alpha_{1}\mathbf{e}_{1}\to\alpha_{2}\mathbf{e}_{2}}<0. (ii) If there is a unique stable state vs{α1e1,α2e2,vm}v_{s}\in\{\alpha_{1}\mathbf{e}_{1},\alpha_{2}\mathbf{e}_{2},\mathbf{v}_{m}\}, exactly one of the following occurs: after suitable translations, the waves converge to a component-wise monotonic traveling wave of (EKPP)0(E_{KPP})_{0} connecting 00 to vsv_{s}; or there are two translations whose separation tends to ++\infty, with one translated limit a semi-extinct front (pfrontei,c0)(p_{front}\mathbf{e}_{i},c_{0}) connecting 00 to αiei\alpha_{i}\mathbf{e}_{i} and the other a component-wise monotonic traveling wave (pback,c0)(\mathbf{p}_{back},c_{0}) connecting αiei\alpha_{i}\mathbf{e}_{i} to vsv_{s}, for a unique iIui\in\mathsf{I}_{u}.

Sources & referencesView supporting material

Primary source

Léo Girardin, “Non-cooperative Fisher–KPP systems: asymptotic behavior of traveling waves”, arXiv:1707.08770 (2017).

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