Vol. 12, No. 6, 2019

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Long time behavior of the master equation in mean field game theory

Pierre Cardaliaguet and Alessio Porretta

Vol. 12 (2019), No. 6, 1397–1453

Mean field game (MFG) systems describe equilibrium configurations in games with infinitely many interacting controllers. We are interested in the behavior of this system as the horizon becomes large, or as the discount factor tends to 0. We show that, in these two cases, the asymptotic behavior of the mean field game system is strongly related to the long time behavior of the so-called master equation and to the vanishing discount limit of the discounted master equation, respectively. Both equations are nonlinear transport equations in the space of measures. We prove the existence of a solution to an ergodic master equation, towards which the time-dependent master equation converges as the horizon becomes large, and towards which the discounted master equation converges as the discount factor tends to 0. The whole analysis is based on new estimates for the exponential rates of convergence of the time-dependent and the discounted MFG systems, respectively.

mean field games, weak KAM theory, long time behavior
Mathematical Subject Classification 2010
Primary: 35B40, 35F21
Received: 13 October 2017
Revised: 24 July 2018
Accepted: 18 October 2018
Published: 7 February 2019
Pierre Cardaliaguet
Université de Paris-Dauphine
PSL Research University
Alessio Porretta
Dipartimento di Matematica
Università di Roma “Tor Vergata”