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arXiv 0707.1256math.FAmath.CA
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非线性周期Sturm-Liouville算子临界集的几何

The geometry of the critical set of nonlinear periodic Sturm-Liouville operators

Dan Burghelea, Nicolau C. Saldanha, Carlos Tomei

摘要:

研究了定义在周期函数H^p(S^1),p ≥ 1的索伯列夫空间上的非线性微分算子F(u)= -u”+ f(u)的临界集C.设R^2_{xy} \subset R^3为平面z = 0,对于n > 0,设cone_n为圆锥x^2 + y^2 = tan^2 z,|z - 2 π n| < pi/2;还设置Sigma = R^2_{xy} U U_{n > 0} cone_n。对于一般的光滑非线性函数f:R -> R,证明了(H^p(S^1),C)与(R^3,Sigma)x H之间存在同构,其中H是实可分的无限维希尔伯特空间.

英文摘要:

We study the critical set C of the nonlinear differential operator F(u) = -u" + f(u) defined on a Sobolev space of periodic functions H^p(S^1), p >= 1. Let R^2_{xy} \subset R^3 be the plane z = 0 and, for n > 0, let cone_n be the cone x^2 + y^2 = tan^2 z, |z - 2 pi n| < pi/2; also set Sigma = R^2_{xy} U U_{n > 0} cone_n. For a generic smooth nonlinearity f: R -> R with surjective derivative, we show that there is a diffeomorphism between the pairs (H^p(S^1), C) and (R^3, Sigma) x H where H is a real separable infinite dimensional Hilbert space.

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