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On the asymptotic behaviour of first-passage-time densities for one-dimensional diffusion processes and varying boundaries

Published online by Cambridge University Press:  01 July 2016

V. Giorno*
Affiliation:
University of Salerno
A. G. Nobile*
Affiliation:
University of Salerno
L. M. Ricciardi*
Affiliation:
University of Naples
*
Postal address: Dipartimento di Informatica e Applicazioni, University of Salerno, 84100 Salerno, Italy.
Postal address: Dipartimento di Informatica e Applicazioni, University of Salerno, 84100 Salerno, Italy.
∗∗Postal address: Dipartimento di Matematica e Applicazioni, Università di Napoli, Via Mezzocannone 8, 80134 Napoli, Italy.

Abstract

Making use of the integral equations given in [1], [2] and [3], the asymptotic behaviour of the first-passage time (FPT) p.d.f.'s through certain time-varying boundaries, including periodic boundaries, is determined for a class of one-dimensional diffusion processes with steady-state density. Sufficient conditions are given for the cases both of single and of pairs of asymptotically constant and asymptotically periodic boundaries, under which the FPT densities asymptotically exhibit an exponential behaviour. Explicit expressions are then worked out for the processes that can be obtained from the Ornstein–Uhlenbeck process by spatial transformations. Some new asymptotic results for the FPT density of the Wiener process are finally proved, together with a few miscellaneous results.

Type
Research Article
Copyright
Copyright © Applied Probability Trust 1990 

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