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Time-Dependent Mean-Field Games in the Subquadratic Case

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TLDR
In this paper, the authors considered time-dependent mean-field games with subquadratic Hamiltonians and power-like local dependence on the measure and established existence of classical solutions under a certain set of conditions depending on both the growth of the Hamiltonian and the dimension.
Abstract
In this paper we consider time-dependent mean-field games with subquadratic Hamiltonians and power-like local dependence on the measure. We establish existence of classical solutions under a certain set of conditions depending on both the growth of the Hamiltonian and the dimension. This is done by combining regularity estimates for the Hamilton-Jacobi equation based on the Gagliardo-Nirenberg interpolation inequality with polynomial estimates for the Fokker-Planck equation. This technique improves substantially the previous results on the regularity of time-dependent mean-field games.

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Journal ArticleDOI

Mean Field Games Models—A Brief Survey

TL;DR: A brief survey of mean-field models as well as recent results and techniques is presented, and a definition of relaxed solution for mean- field games that allows to establish uniqueness under minimal regularity hypothesis is proposed.
Journal ArticleDOI

Second order mean field games with degenerate diffusion and local coupling

TL;DR: In this paper, a second order mean field games system of partial differential equations is analyzed and the existence and uniqueness of suitably defined weak solutions are characterized as minimizers of two optimal control problems.
Journal ArticleDOI

Weak Solutions to Fokker–Planck Equations and Mean Field Games

TL;DR: In this paper, the authors considered the case of local couplings, where the running cost depends on the pointwise value of the distribution density of the agents, in which case the smoothness of solutions is mostly unknown.
Journal ArticleDOI

Mean field games systems of first order

TL;DR: In this paper, the authors consider a system of mean field games with local coupling in the deterministic limit and prove existence and uniqueness of the weak solution, characterizing this solution as the minimizer of some optimal control of Hamilton-Jacobi and continuity equations.
Journal ArticleDOI

Mean field games via controlled martingale problems: Existence of Markovian equilibria

TL;DR: In this paper, the authors studied mean field games in the framework of controlled martingale problems, and general existence theorems were proven in which the equilibrium control is Markovian.
References
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Book

Linear and Quasilinear Equations of Parabolic Type

TL;DR: In this article, the authors considered a hyperbolic parabolic singular perturbation problem for a quasilinear equation of kirchhoff type and obtained parameter dependent time decay estimates of the difference between the solutions of the solution of a quasi-linear parabolic equation and the corresponding linear parabolic equations.
Book

Controlled Markov processes and viscosity solutions

TL;DR: In this paper, an introduction to optimal stochastic control for continuous time Markov processes and to the theory of viscosity solutions is given, as well as a concise introduction to two-controller, zero-sum differential games.
Journal ArticleDOI

Mean Field Games

TL;DR: In this paper, the authors present three examples of the mean-field approach to modelling in economics and finance (or other related subjects) and show that these nonlinear problems are essentially well-posed problems with unique solutions.
Journal ArticleDOI

Large population stochastic dynamic games: closed-loop McKean-Vlasov systems and the Nash certainty equivalence principle

TL;DR: The McKean-Vlasov NCE method presented in this paper has a close connection with the statistical physics of large particle systems: both identify a consistency relationship between the individual agent at the microscopic level and the mass of individuals at the macroscopic level.
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