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arXiv · 1905.04049

Green's Functions with Oblique Neumann Boundary Conditions in the Quadrant

Sandro Franceschi
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Abstract

We study semi-martingale obliquely reflected Brownian motion with drift in the first quadrant of the plane in the transient case. Our main result determines a general explicit integral expression for the moment generating function of Green's functions of this process. To that purpose we establish a new kernel functional equation connecting moment generating functions of Green's functions inside the quadrant and on its edges. This is reminiscent of the recurrent case where a functional equation derives from the basic adjoint relationship which characterizes the stationary distribution. This equation leads us to a non-homogeneous Carleman boundary value problem. Its resolution provides a formula for the moment generating function in terms of contour integrals and a conformal mapping.

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Sandro Franceschi. 2019-05-10. Green's Functions with Oblique Neumann Boundary Conditions in the Quadrant. https://doi.org/10.1007/s10959-020-01043-8

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