The paper proves global well-posedness of mean field games master equations with an endogenous common noise variable under flat or L2/displacement monotonicity conditions, including in the presence of additive common noise.
Global Well-Posedness of Displacement Monotone Degenerate Mean Field Games Master Equations
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abstract
In this paper we construct global in time classical solutions to mean field games master equations in the lack of idiosyncratic noise in the individual agents' dynamics. These include both deterministic models and dynamics driven solely by a Brownian common noise. We consider a general class of non-separable Hamiltonians and final data functions that are supposed to be displacement monotone. Our main results unify and generalize in particular some of the well-posedness results on displacement monotone master equations obtained recently by Gangbo--M\'esz\'aros and Gangbo--M\'esz\'aros--Mou--Zhang.
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A study of common noise in mean field games
The paper proves global well-posedness of mean field games master equations with an endogenous common noise variable under flat or L2/displacement monotonicity conditions, including in the presence of additive common noise.