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doi: 10.3934/jimo.2021074
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Open-loop solvability for mean-field stochastic linear quadratic optimal control problems of Markov regime-switching system

Kehan Si 1, , Zhenda Xu 1, , Ka Fai Cedric Yiu 2,, and  Xun Li 2,

1. 

School of Mathematics, Shandong University, Jinan, Shandong Province, 250100, China
2. 

Department of Applied Mathematics, The Hong Kong Polytechnic University, Hong Kong, China

* Corresponding author: Ka Fai Cedric Yiu

Received  September 2020 Revised  January 2021 Early access April 2021

This paper investigates the mean-field stochastic linear quadratic optimal control problem of Markov regime switching system (M-MF-SLQ, for short). The representation of the cost functional for the M-MF-SLQ is derived using the technique of operators. It is shown that the convexity of the cost functional is necessary for the finiteness of the M-MF-SLQ problem, whereas uniform convexity of the cost functional is sufficient for the open-loop solvability of the problem. By considering a family of uniformly convex cost functionals, a characterization of the finiteness of the problem is derived and a minimizing sequence, whose convergence is equivalent to the open-loop solvability of the problem, is constructed. We demonstrate with a few examples that our results can be employed for tackling some financial problems such as mean-variance portfolio selection problem.

Keywords: Mean-field, linear quadratic optimal control, Markov regime switching, open-loop solvability.
Mathematics Subject Classification: Primary: 49N10, 49N35; Secondary: 93E20.
Citation: Kehan Si, Zhenda Xu, Ka Fai Cedric Yiu, Xun Li. Open-loop solvability for mean-field stochastic linear quadratic optimal control problems of Markov regime-switching system. Journal of Industrial & Management Optimization, doi: 10.3934/jimo.2021074
References:
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C. Donnelly and A. J. Heunis, Quadratic Risk Minimization in a Regime-Switching Model with Portfolio Constraints, SIAM Journal on Control and Optimization, 50 (2012), 2431–2461. doi: 10.1137/100809271.  Google Scholar

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X. Li and X. Y. Zhou, Indefinite stochastic LQ controls with Markovian jumps in a finite time horizon, Communications in Information and Systems, 2 (2002), 265-282.  doi: 10.4310/CIS.2002.v2.n3.a4.  Google Scholar

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[21]

J. Sun, Mean-Field Stochastic Linear Quadratic Optimal Control Problems: Open-Loop Solvabilities, ESAIM: Control, Optimisation and Calculus of Variations, 23 (2017), 1099-1127.  doi: 10.1051/cocv/2016023.  Google Scholar

[22]

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[23]

W. M. Wonham, On a matrix Riccati equation of stochastic control, SIAM Journal on Control, 6 (1968), 681–697. doi: 10.1137/0306044.  Google Scholar

[24]

Z. Wu and X.-R. Wang, FBSDE with Poisson process and its application to linear quadratic stochastic optimal control problem with random jumps, Acta Automatica Sinica, 29 (2003), 821-826.   Google Scholar

[25]

G. G. Yin and Q. Zhang, Continuous-Time Markov Chains and Applications: A Two-Time-Scale Approach, 2nd Edition, Springer, New York, 2013. doi: 10.1007/978-1-4614-4346-9.  Google Scholar

[26]

K.-F. C. Yiu, J. Liu, T. K. Siu and W.-K. Ching, Optimal portfolios with regime switching and value-at-risk constraint, Automatica, 46 (2010), 979-989.  doi: 10.1016/j.automatica.2010.02.027.  Google Scholar

[27]

J. Yong and X. Y. Zhou, Stochastic Controls: Hamiltonian Systems and HJB Equations, Springer New York, 1999. doi: 10.1007/978-1-4612-1466-3.  Google Scholar

[28]

J. Yong, Linear-quadratic optimal control problems for mean-field stochastic differential equations, SIAM Journal on Control and Optimization, 51 (2013), 2809-2838.  doi: 10.1137/120892477.  Google Scholar

[29]

Z. Yu, Infinite horizon jump-diffusion forward-backward stochastic differential equations and their application to backward linear-quadratic problems, ESAIM: Control, Optimisation and Calculus of Variations, 23 (2017), 1331–1359. doi: 10.1051/cocv/2016055.  Google Scholar

[30]

X. Zhang, R. J. Elliott, T. K. Siu and J. Guo, Markovian regime-switching market completion using additional markov jump assets, IMA Journal of Management Mathematics, 23 (2012), 283–305. doi: 10.1093/imaman/dpr018.  Google Scholar

[31]

X. Zhang and X. Li, Open-Loop and closed-loop solvabilities for stochastic linear quadratic optimal control problems of Markov regime-switching system, arXiv: 1809.01891, 2018. Google Scholar

[32]

X. Zhang, Z. Sun and J. Xiong, A general stochastic maximum principle for a Markov regime switching jump-diffusion model of mean-field type, SIAM Journal on Control and Optimization, 56 (2018), 2563–2592. doi: 10.1137/17M112395X.  Google Scholar

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X. Y. Zhou and G. Yin, Markowitz's mean-variance portfolio selection with regime switching: A continuous-time model, SIAM Journal on Control and Optimization, 42 (2003), 1466-1482.  doi: 10.1137/S0363012902405583.  Google Scholar

show all references

References:
[1]

D. Andersson and B. Djehiche, A maximum principle for SDEs of mean-field type, Applied Mathematics and Optimization, 63 (2011), 341-356.  doi: 10.1007/s00245-010-9123-8.  Google Scholar

[2]

J.-M. Bismut, Linear quadratic optimal stochastic control with random coefficients, SIAM Journal on Control and Optimization, 14 (1976), 419–444. doi: 10.1137/0314028.  Google Scholar

[3]

R. Buckdahn, B. Djehiche and J. Li, A general stochastic maximum principle for SDEs of mean-field type, Applied Mathematics and Optimization, 64 (2011), 197-216.  doi: 10.1007/s00245-011-9136-y.  Google Scholar

[4]

R. Buckdahn, B. Djehiche, J. Li and S. Peng, Mean-field backward stochastic differential equations: A limit approach, Annals of Probability, 37 (2009), 1524-1565.  doi: 10.1214/08-AOP442.  Google Scholar

[5]

X. Cui, X. Li and D. Li, Unified framework of mean-field formulations for optimal multi-period mean-variance portfolio selection, IEEE Transactions on Automatic Control, 59 (2014), 1833–1844. doi: 10.1109/TAC.2014.2311875.  Google Scholar

[6]

C. Donnelly, Suffcient stochastic maximum principle in a regime-switching diffusion model, Applied Mathematics & Optimization, 64 (2011), 155-169.  doi: 10.1007/s00245-010-9130-9.  Google Scholar

[7]

C. Donnelly and A. J. Heunis, Quadratic Risk Minimization in a Regime-Switching Model with Portfolio Constraints, SIAM Journal on Control and Optimization, 50 (2012), 2431–2461. doi: 10.1137/100809271.  Google Scholar

[8]

R. J. Elliott, L. Aggoun and J. B. Moore, Hidden Markov Models: Estimation and Control, Applications of Mathematics, New York: Springer-Verlag, 1995.  Google Scholar

[9]

R. Elliott, X. Li and Y.-H. Ni, Discrete time mean-field stochastic linear-quadratic optimal control problems, Automatica, 49 (2013), 3222-3233.  doi: 10.1016/j.automatica.2013.08.017.  Google Scholar

[10]

J. Huang, X. Li and J. Yong, A linear-quadratic optimal control problem for mean-field stochastic differential equations in infinite horizon, Mathematical Control & Related Fields, 5 (2015), 97-139.  doi: 10.3934/mcrf.2015.5.97.  Google Scholar

[11]

M. Kac, Foundations of kinetic theory, Proceedings of the Third Berkeley Symposium on Mathematical Statistics and Probability, 3 (1956), 171-197.   Google Scholar

[12]

H. Kushner, Optimal stochastic control, IRE Transactions on Automatic Control, 7 (1962), 120–122. doi: 10.1109/TAC.1962.1105490.  Google Scholar

[13]

X. Li and X. Y. Zhou, Indefinite stochastic LQ controls with Markovian jumps in a finite time horizon, Communications in Information and Systems, 2 (2002), 265-282.  doi: 10.4310/CIS.2002.v2.n3.a4.  Google Scholar

[14]

X. Li, J. Sun and J. Yong, Mean-field stochastic linear quadratic optimal control problems: Closed-loop solvability, Probability, Uncertainty and Quantitative Risk, 1 (2016), Paper No. 2, 24 pp. doi: 10.1186/s41546-016-0002-3.  Google Scholar

[15]

X. Li, X. Y. Zhou and M. Ait Rami, Indefinite stochastic linear quadratic control with Markovian jumps in infinite time horizon, Journal of Global Optimization, 27 (2003), 149-175.  doi: 10.1023/A:1024887007165.  Google Scholar

[16]

X. Li and X. Y. Zhou, Continuous-time mean-variance efficiency: The 80% rule, The Annals of Applied Probability, 16 (2006), 1751-1763.  doi: 10.1214/105051606000000349.  Google Scholar

[17]

Y. Liu, G. Yin and X. Y. Zhou, Near-optimal controls of random-switching LQ problems with indefinite control weight costs, Automatica, 41 (2005), 1063-1070.  doi: 10.1016/j.automatica.2005.01.002.  Google Scholar

[18]

R. Penrose, A generalized inverse for matrices, Mathematical Proceedings of the Cambridge Philosophical Society, 51 (1955), 406-413.  doi: 10.1017/S0305004100030401.  Google Scholar

[19]

J. Sun and J. Yong, Linear quadratic stochastic differential games: open-loop and closed-loop saddle points, SIAM Journal on Control and Optimization, 52 (2014), 4082-4121.  doi: 10.1137/140953642.  Google Scholar

[20]

J. Sun, X. Li and J. Yong, Open-loop and closed-loop solvabilities for stochastic linear quadratic optimal control problems, SIAM Journal on Control and Optimization, 54 (2016), 2274–2308. doi: 10.1137/15M103532X.  Google Scholar

[21]

J. Sun, Mean-Field Stochastic Linear Quadratic Optimal Control Problems: Open-Loop Solvabilities, ESAIM: Control, Optimisation and Calculus of Variations, 23 (2017), 1099-1127.  doi: 10.1051/cocv/2016023.  Google Scholar

[22]

R. Tao and Z. Wu, Maximum principle for optimal control problems of forward-backward regime-switching system and applications, Systems & Control Letters, 61 (2012), 911-917.  doi: 10.1016/j.sysconle.2012.06.006.  Google Scholar

[23]

W. M. Wonham, On a matrix Riccati equation of stochastic control, SIAM Journal on Control, 6 (1968), 681–697. doi: 10.1137/0306044.  Google Scholar

[24]

Z. Wu and X.-R. Wang, FBSDE with Poisson process and its application to linear quadratic stochastic optimal control problem with random jumps, Acta Automatica Sinica, 29 (2003), 821-826.   Google Scholar

[25]

G. G. Yin and Q. Zhang, Continuous-Time Markov Chains and Applications: A Two-Time-Scale Approach, 2nd Edition, Springer, New York, 2013. doi: 10.1007/978-1-4614-4346-9.  Google Scholar

[26]

K.-F. C. Yiu, J. Liu, T. K. Siu and W.-K. Ching, Optimal portfolios with regime switching and value-at-risk constraint, Automatica, 46 (2010), 979-989.  doi: 10.1016/j.automatica.2010.02.027.  Google Scholar

[27]

J. Yong and X. Y. Zhou, Stochastic Controls: Hamiltonian Systems and HJB Equations, Springer New York, 1999. doi: 10.1007/978-1-4612-1466-3.  Google Scholar

[28]

J. Yong, Linear-quadratic optimal control problems for mean-field stochastic differential equations, SIAM Journal on Control and Optimization, 51 (2013), 2809-2838.  doi: 10.1137/120892477.  Google Scholar

[29]

Z. Yu, Infinite horizon jump-diffusion forward-backward stochastic differential equations and their application to backward linear-quadratic problems, ESAIM: Control, Optimisation and Calculus of Variations, 23 (2017), 1331–1359. doi: 10.1051/cocv/2016055.  Google Scholar

[30]

X. Zhang, R. J. Elliott, T. K. Siu and J. Guo, Markovian regime-switching market completion using additional markov jump assets, IMA Journal of Management Mathematics, 23 (2012), 283–305. doi: 10.1093/imaman/dpr018.  Google Scholar

[31]

X. Zhang and X. Li, Open-Loop and closed-loop solvabilities for stochastic linear quadratic optimal control problems of Markov regime-switching system, arXiv: 1809.01891, 2018. Google Scholar

[32]

X. Zhang, Z. Sun and J. Xiong, A general stochastic maximum principle for a Markov regime switching jump-diffusion model of mean-field type, SIAM Journal on Control and Optimization, 56 (2018), 2563–2592. doi: 10.1137/17M112395X.  Google Scholar

[33]

X. Y. Zhou and G. Yin, Markowitz's mean-variance portfolio selection with regime switching: A continuous-time model, SIAM Journal on Control and Optimization, 42 (2003), 1466-1482.  doi: 10.1137/S0363012902405583.  Google Scholar

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