Optimal position targeting via decoupling fields
Optimal position targeting via decoupling fields
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DOI:
10.1214/19-aap1511
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发表时间:
2020-04
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通讯作者:
S. Ankirchner;A. Fromm;T. Kruse;A. Popier
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文献类型:
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作者:
S. Ankirchner;A. Fromm;T. Kruse;A. Popier
We consider a variant of the basic problem of the calculus of variations, where the Lagrangian is convex and subject to randomness adapted to a Brownian filtration. We solve the problem by reducing it, via a limiting argument, to an unconstrained control problem that consists in finding an absolutely continuous process minimizing the expected sum of the Lagrangian and the deviation of the terminal state from a given target position. Using the Pontryagin maximum principle we characterize a solution of the unconstrained control problem in terms of a fully coupled forward-backward stochastic differential equation (FBSDE). We use the method of decoupling fields for proving that the FBSDE has a unique solution.