We study the following initial-boundary value problem for thenonlocal Whitham equation ut+N(u)+Ku=0, (x,t) ∈R+×R+, u(x,0)=u¯(x), x∈R+,where the nonlinearity is N(u)=uxu and K is thepseudodifferential operator on the half-line of order α satisfying1<α<2 and some dissipative conditions. We prove that if theinitial data are such thatxδu¯∈L1, withδ∈(0,½) and the norm||u¯||X+||xδu¯||(L1) is sufficiently small, whereX={ψ∈(L1),ψ'∈L1;||ψ||x=||ψ||(L1)+||ψx||(L1)<∞}, thenthere exists a unique solution u∈C ([0, +∞);L2)∩C(R+, H1) of the initial-valueproblem (1), where Hk is the Sobolev space with norm||Φ||(Hk)=||(1-∂2x)k/2Φ||(L2). We also study large timeasymptotics of the solutions
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机译:我们针对以下问题研究以下初边值问题
非局部Whitham方程u t sub> + N(u)+ Ku = 0,(x,t)∈R +
sup>×R + sup>,u(x,0)= u(x),x∈R + sup>,
非线性为N(u)= u x sub> u且K为
α阶半线上的伪微分算子满足
1 <α<2和一些耗散条件。我们证明,如果
初始数据是这样的
x δ sup>u¯∈L 1 sup>,其中
δ∈(0,½)与范数
|| u ||| X + sup> || x δ sup> u’||(L
1 sup>)足够小,其中
X = {ψ∈(L 1 sup>),
ψ'∈L 1 sup>; ||ψ|| x = ||ψ||(L 1
sup>)+ ||ψ x sub> ||(L 1 sup>)<∞},然后
存在唯一解u∈C([0,+∞);
初始值的L 2 sup>)∩C(R + sup>,H 1 sup>)
问题(1),其中H k sup>是具有范数的Sobolev空间
||Φ||(H k sup>)= ||(1-∂ 2 sub> x
sup>)k /2Φ||(L 2 sup>)。我们也学习大量时间
解决方案的渐近性
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