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arXiv 2004.11832math.OCmath.PR
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带状态转换的约束随机LQ控制及其在证券投资中的应用

Constrained stochastic LQ control with regime switching and application to portfolio selection

Ying Hu, Xiaomin Shi, Zuo Quan Xu

摘要:

研究了一类具有区域切换、随机系数和锥控制约束的随机线性二次型最优控制问题。系数的随机性来源于两个方面:布朗运动和马尔可夫链。利用马尔可夫链的伊藤引理,通过两个新的扩展随机Riccati方程组(ESRE),得到了系统的最优状态反馈控制和最优费用值.我们利用多维比较定理、截断函数技巧、对数变换和John-Nirenberg不等式等工具证明了这两个ESRE的存在唯一性。这些结果,然后应用于研究均值-方差投资组合选择问题与卖空禁止和不与随机参数依赖于布朗运动和马尔可夫链。最后给出了有效投资组合和有效边界的封闭形式。

英文摘要:

This paper is concerned with a stochastic linear-quadratic optimal control problem with regime switching, random coefficients, and cone control constraint. The randomness of the coefficients comes from two aspects: the Brownian motion and the Markov chain. Using Itô's lemma for Markov chain, we obtain the optimal state feedback control and optimal cost value explicitly via two new systems of extended stochastic Riccati equations (ESREs). We prove the existence and uniqueness of the two ESREs using tools including multidimensional comparison theorem, truncation function technique, log transformation and the John-Nirenberg inequality. These results are then applied to study mean-variance portfolio selection problems with and without short-selling prohibition with random parameters depending on both the Brownian motion and the Markov chain. Finally, the efficient portfolios and efficient frontiers are presented in closed forms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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