The Variational Structure and Time-Periodic Solutions for Mean-Field Games Systems
Keywords:
Infinite-dimensional differential games, congestion problems, saddle-point formula tion.Abstract
We observe that mean-field game (MFG) systems admit a two-player infinite-dimensional general-sum differential game formulation. We show that particular regimes of this game reduce to previously known variational principles. Furthermore, based on the game-perspective we derive new variational formulations for first-order MFG systems with congestion. Finally, we use these findings to prove the existence of time-periodic solutions for viscous MFG systems with a coupling that is not a non-decreasing function of density.
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