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arXiv 2203.10481math.OC
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具有部分信息的线性二次大种群问题:Hamilton方法和Riccati方法

Linear-Quadratic Large-Population Problem with Partial Information: Hamiltonian Approach and Riccati Approach

Min Li, Tianyang Nie, Zhen Wu

摘要:

研究了一类部分信息线性二次平均场对策问题。考虑了一般的随机大种群系统,其中每个智能体的动态扩散项可以依赖于状态和控制。我们研究了控制约束和无约束两种情况。在控制受限的情况下,利用Hamilton方法和凸分析,通过投影算子得到显式分散策略。导出了相应的Hamilton型相容性条件系统,证明了该系统是一个带投影算子的非线性平均场正倒向随机微分方程.利用折扣法证明了这类方程的适定性。此外,还验证了相应的$\varepsilon$ -Nash均衡性质.在控制无约束的情况下,分散策略可以通过Riccati方法进一步显式地表示为过滤状态的反馈。讨论了一类新的Riccati型相容性条件系统解的存在唯一性。作为应用,通过对一般银行间借贷问题的研究,说明了部分信息的影响是不可忽略的。

英文摘要:

This paper studies a class of partial information linear-quadratic mean-field game problems. A general stochastic large-population system is considered, where the diffusion term of the dynamic of each agent can depend on the state and control. We study both the control constrained case and unconstrained case. In control constrained case, by using Hamiltonian approach and convex analysis, the explicit decentralized strategies can be obtained through projection operator. The corresponding Hamiltonian type consistency condition system is derived, which turns out to be a nonlinear mean-field forward-backward stochastic differential equation with projection operator. The well-posedness of such kind of equations is proved by using discounting method. Moreover, the corresponding $\varepsilon$-Nash equilibrium property is verified. In control unconstrained case, the decentralized strategies can be further represented explicitly as the feedback of filtered state through Riccati approach. The existence and uniqueness of a solution to a new Riccati type consistency condition system is also discussed. As an application, a general inter-bank borrowing and lending problem is studied to illustrate that the effect of partial information cannot be ignored.

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