Friday, September 28, 2012

1109.5829 (Fumio Hiroshima et al.)

Probabilistic Representation and Fall-Off of Bound States of
Relativistic Schrödinger Operators with Spin 1/2

Fumio Hiroshima, Takashi Ichinose, József Lörinczi
A Feynman-Kac type formula of relativistic Schr\"odinger operators with unbounded vector potential and spin 1/2 is given in terms of a three-component process consisting of Brownian motion, a Poisson process and a subordinator. This formula is obtained for unbounded magnetic fields and magnetic field with zeros. From this formula an energy comparison inequality is derived. Spatial decay of bound states is established separately for growing and decaying potentials by using martingale methods.
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