Survival probability of a Brownian motion in a planar wedge of arbitrary angle

Marie Chupeau 1 Olivier Bénichou 1 Satya N. Majumdar 2

Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2015, 91, pp.032106

We study the survival probability and the first-passage time distribution for a Brownian motion in a planar wedge with infinite absorbing edges. We generalize existing results obtained for wedge angles of the form $\pi/n$ with $n$ a positive integer to arbitrary angles, which in particular cover the case of obtuse angles. We give explicit and simple expressions of the survival probability and the first-passage time distribution in which the difference between an arbitrary angle and a submultiple of $\pi$ is contained in three additional terms. As an application, we obtain the short time development of the survival probability in a wedge of arbitrary angle.

  • 1. LPTMC - Laboratoire de Physique Théorique de la Matière Condensée
  • 2. LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques