Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-02-19
Journal of Physics A Mathematical and Theoretical 41 (2008) 365005
Physics
Condensed Matter
Statistical Mechanics
Submitted to J. Phys. A
Scientific paper
10.1088/1751-8113/41/36/365005
We derive P(M,t_m), the joint probability density of the maximum M and the time t_m at which this maximum is achieved for a class of constrained Brownian motions. In particular, we provide explicit results for excursions, meanders and reflected bridges associated with Brownian motion. By subsequently integrating over M, the marginal density P(t_m) is obtained in each case in the form of a doubly infinite series. For the excursion and meander, we analyse the moments and asymptotic limits of P(t_m) in some detail and show that the theoretical results are in excellent accord with numerical simulations. Our primary method of derivation is based on a path integral technique; however, an alternative approach is also outlined which is founded on certain "agreement formulae" that are encountered more generally in probabilistic studies of Brownian motion processes.
Kearney Michael J.
Majumdar Satya N.
Randon-Furling Julien
Yor Marc
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