Mean field games via controlled martingale problems: Existence of Markovian equilibria

STOCHASTIC PROCESSES AND THEIR APPLICATIONS

卷:125

Article

Lacker, Daniel

关键词: Mean field games;    Controlled martingale problem;    Relaxed control;   

DOI  :  10.1016/j.spa.2015.02.006

来源: Elsevier

【 摘 要 】

Mean field games are studied in the framework of controlled martingale problems, and general existence theorems are proven in which the equilibrium control is Markovian. The framework is flexible enough to include degenerate volatility, which may depend on both the control and the mean field. The objectives need not be strictly convex, and the mean field interactions considered are nonlocal and Wasserstein-continuous. When the volatility is nondegenerate, continuity assumptions may be weakened considerably. The proofs first use relaxed controls to establish existence. Then, using a convexity assumption and measurable selection arguments, strict (non-relaxed) Markovian equilibria are constructed from relaxed equilibria. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free