Levy Processes: Hitting time, overshoot and undershoot - part I: Functional equations

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dc.creatorRoynette, Bernard
dc.creatorVallois, Pierre
dc.creatorVolpi, Agnes
dc.date2005-07-02
dc.date.accessioned2026-07-07T05:21:20Z
dc.date.available2026-07-07T05:21:20Z
dc.descriptionLet (X_t, t >=0) be a Levy process started at 0, with Levy measure nu, and T_x the first hitting time of level x>0: T_x := inf{t>=0; X_t>x}. Let F(theta,mu,rho,.) be the joint Laplace transform of (T_x, K_x, L_x): F(theta,mu,rho,x) := E (e^{-theta T_x - mu K_x - rho L_x} 1_{T_x<+infinity}), where theta>=0, mu>=0, rho>=0, x>0, K_x := X_{T_x} - x and L_x := x - X_{T_{x^-}}. If nu(R) < + \infinity and integral_1^{+\infty} e^{sy} nu (dy) < +infinity for some s>0, then we prove that F(theta,mu,rho,.) is the unique solution of an integral equation and has a subexponential decay at infinity when theta>0 or theta=0 and E(X_1)<0. If nu is not necessarily a finite measure but verifies integral_{-infinity}^{-1} e^{-sy} nu (dy) < +infinity for any s>0, then the x-Laplace transform of F(theta,mu,rho,.) satisfies some kind of integral equation. This allows us to prove that F(theta,mu,rho,.) is a solution to a second integral equation.
dc.descriptionManuscript P660 submitted to SPA, October 2004. 30 pages, 5 figures, 25 references
dc.identifierhttps://arxiv.org/abs/math/0507034
dc.identifierhttp://arxiv.org/abs/math/0507034
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/75654
dc.subjectProbability
dc.titleLevy Processes: Hitting time, overshoot and undershoot - part I: Functional equations
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