Cetin, Umut
(2019)
*Linear inverse problems for Markov processes and their regularisation.*
Stochastic Processes and Their Applications.
ISSN 0304-4149

Text (Linear inverse problems for Markov processes and their regularisation)
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## Abstract

We study the solutions of the inverse problem g(z)=∫f(y)P T(z,dy)for a given g, where (P t(⋅,⋅)) t≥0 is the transition function of a given symmetric Markov process, X, and T is a fixed deterministic time, which is linked to the solutions of the ill-posed Cauchy problem u t+Au=0,u(0,⋅)=g,where A is the generator of X. A necessary and sufficient condition ensuring square integrable solutions is given. Moreover, a family of regularisations for above problems is suggested. We show in particular that these inverse problems have a solution when X is replaced by ξX+(1−ξ)J, where ξ is a Bernoulli random variable and J is a suitably constructed jump process. The probability of success for ξ can be chosen arbitrarily close to 1 and thereby leading to a jump component whose jumps are rarely visible in the practical implementations of the regularisation.

Item Type: | Article |
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Official URL: | https://www.journals.elsevier.com/stochastic-proce... |

Divisions: | Statistics |

Subjects: | H Social Sciences > HA Statistics |

Date Deposited: | 26 Nov 2019 11:48 |

Last Modified: | 26 Jan 2020 00:21 |

URI: | http://eprints.lse.ac.uk/id/eprint/102633 |

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