平均场二次倒向随机微分方程及相关平均场投资组合控制博弈
Mean-field quadratic BSDEs and related mean-field portfolio games of controls
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中文总结 AI 辅助
本文研究一类源于指数效用平均场投资组合博弈的新平均场二次倒向随机微分方程,证明其局部与全局适定性,并用于证明两类博弈全局均衡的存在唯一性。
中文摘要 AI 辅助
我们研究了一类新的平均场二次倒向随机微分方程(qBSDEs),这类方程源于具有指数效用的平均场投资组合博弈。此类博弈的典型例子包括具有价格冲击的平均场投资组合博弈,以及具有市场出清条件的有限合约定价模型。这些平均场qBSDEs的生成元包含二次项 $\mathbb{E}[Z]^{\top} Z$ 和 $|\mathbb{E}[Z]|^2$,而非经典的逐路径 $Z^\top Z$ 项。我们在终值及其Malliavin导数的 $L^q$-可积性假设下证明了局部适定性,并在Malliavin导数的额外指数可积性条件下证明了全局适定性。然后,我们通过我们的qBSDE理论证明了上述两个平均场博弈的全局均衡的存在性和唯一性。
英文摘要
We study a new class of mean-field quadratic backward stochastic differential equations (qBSDEs) arising from mean-field portfolio games with exponential utility. Typical examples of such games include a mean-field portfolio game with price impact, and a finite-contract pricing model with market clearing conditions. Generators of these mean-field qBSDEs contain quadratic terms $\mathbb{E}[Z]^{\top} Z$ and $|\mathbb{E}[Z]|^2$, instead of the classical pathwise $Z^\top Z$ term. We prove local well-posedness under $L^q$-integrability assumptions on terminals and their Malliavin derivatives, and global well-posedness under an extra exponential integrability condition on the Malliavin derivatives. Then we show the existence and uniqueness of global equilibria of the above two mean-field games via our qBSDE theory.
发表机构
- Research Center for Mathematics and Interdisciplinary Sciences, Shandong University(山东大学数学与交叉科学研究院)
- Department of Mathematics, Humboldt University Berlin(柏林洪堡大学数学系)
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