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A Stochastic Maximum Principle for Risk-Sensitive Mean-Field Type Control

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  • Boualem Djehiche
  • Hamidou Tembine
  • Raul Tempone
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    Abstract

    In this paper we study mean-field type control problems with risk-sensitive performance functionals. We establish a stochastic maximum principle (SMP) for optimal control of stochastic differential equations (SDEs) of mean-field type, in which the drift and the diffusion coefficients as well as the performance functional depend not only on the state and the control but also on the mean of the distribution of the state. Our result extends the risk-sensitive SMP (without mean-field coupling) of Lim and Zhou (2005), derived for feedback (or Markov) type optimal controls, to optimal control problems for non-Markovian dynamics which may be time-inconsistent in the sense that the Bellman optimality principle does not hold. In our approach to the risk-sensitive SMP, the smoothness assumption on the value-function imposed in Lim and Zhou (2005) need not to be satisfied. For a general action space a Peng's type SMP is derived, specifying the necessary conditions for optimality. Two examples are carried out to illustrate the proposed risk-sensitive mean-field type SMP under linear stochastic dynamics with exponential quadratic cost function. Explicit solutions are given for both mean-field free and mean-field models.

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    File URL: http://arxiv.org/pdf/1404.1441
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    Paper provided by arXiv.org in its series Papers with number 1404.1441.

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    Date of creation: Apr 2014
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    Handle: RePEc:arx:papers:1404.1441

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