Laplace transform identities for diffusions, with applications to rebates and barrier options

Polska Akademia Nauk
Publication Type:
Conference Proceeding
Banach Centre Publications: Advances in Mathematics of Finance, 2008, pp. 139 - 157
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Using a simple integral identity, we derive general expressions for the Laplace transform of the transition density of the process, if killing or reflecting boundaries are specified. We also obtain a number of useful expressions for the Laplace transforms of some functions of first-passage times for the diffusion. These results are applied to the special case of squared Bessel processes with killing or reflecting boundaries. In particular, we demonstrate how the above-mentioned integral identity enables us to derive the transition density of a squared Bessel process killed at the origin, without the need to invert a Laplace transform. Finally, as an application, we consider the problem of pricing barrier options on an index described by the minimal market model.
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