Stochastic integration with respect to arbitrary collections of continuous semimartingales and applications to mathematical finance

Kardaras, Constantinos (2023) Stochastic integration with respect to arbitrary collections of continuous semimartingales and applications to mathematical finance. Annals of Applied Probability. ISSN 1050-5164 (In Press)

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Abstract

Stochastic integrals are defined with respect to a collection P = (Pi; i 2 I) of continuous semimartingales, imposing no assumptions on the index set I and the subspace of RI where P takes values. The integrals are constructed though finite-dimensional approximation, identifying the appropriate local geometry that allows extension to infinite dimensions. For local martingale integrators, the resulting space S(P) of stochastic integrals has an operational characterisation via a corresponding set of integrands R(C), constructed with only reference the covariation structure C of P. This bijection between R(C) and the (closed in the semimartingale topology) set S(P) extends to families of continuous semimartingale integrators for which the drift process of P belongs to R(C). In the context of infinite-asset models in Mathematical Finance, the latter structural condition is equivalent to a certain natural form of market viability. The enriched class of wealth processes via extended stochastic integrals leads to exact analogues of optional decomposition and hedging duality as the finite-asset case. A corresponding characterisation of market completeness in this setting is provided.

Item Type:	Article
Official URL:	https://projecteuclid.org/journals/annals-of-appli...
Additional Information:	© 2023 Institute of Mathematical Statistics
Divisions:	Statistics
Subjects:	H Social Sciences > HA Statistics
Date Deposited:	14 Dec 2023 16:09
Last Modified:	08 May 2024 21:25
URI:	http://eprints.lse.ac.uk/id/eprint/121057

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