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arXiv 0906.0103math-phmath.MP
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Schroedinger算子用拉普拉斯Bernstein函数的路径积分表示

Path Integral Representation for Schroedinger Operators with Bernstein Functions of the Laplacian

Fumio Hiroshima, Takashi Ichinose, Jozsef Lorinczi

摘要:

建立了广义薛定谔算子在一类拉普拉斯算子的Bernstein函数下的路径积分表示.利用Bernstein函数与Lévy从属函数的一一对应,将标准Feynman-Kac公式中的布朗运动的作用用从属布朗运动代替.作为具体的例子,分数和相对论薛定谔算子与磁场和自旋的覆盖。在允许奇异磁场和奇异外势以及任意整数和半整数自旋值的条件下,得到了这些算子的自伴性结果。这种方法还允许提出一个广义加藤类的概念,其中相关的广义薛定谔半群的超压缩性被证明。因此,反磁和能量的比较不等式也得到了。

英文摘要:

Path integral representations for generalized Schrödinger operators obtained under a class of Bernstein functions of the Laplacian are established. The one-to-one correspondence of Bernstein functions with Lévy subordinators is used, thereby the role of Brownian motion entering the standard Feynman-Kac formula is taken here by subordinated Brownian motion. As specific examples, fractional and relativistic Schrödinger operators with magnetic field and spin are covered. Results on self-adjointness of these operators are obtained under conditions allowing for singular magnetic fields and singular external potentials as well as arbitrary integer and half-integer spin values. This approach also allows to propose a notion of generalized Kato class for which hypercontractivity of the associated generalized Schrödinger semigroup is shown. As a consequence, diamagnetic and energy comparison inequalities are also derived.

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