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Existence and Uniqueness Result for Mean Field Games with Congestion Effect on Graphs

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Abstract

This paper presents a general existence and uniqueness result for mean field games equations on graphs (\(\mathcal {G}\)-MFG). In particular, our setting allows to take into account congestion effects of almost any form. These general congestion effects are particularly relevant in graphs in which the cost to move from one node to another may for instance depend on the proportion of players in both the source node and the target node. Existence is proved using a priori estimates and a fixed point argument à la Schauder. We propose a new criterion to ensure uniqueness in the case of Hamiltonian functions with a complex (non-local) structure. This result generalizes the discrete counterpart of uniqueness results obtained in Lasry and Lions (C. R. Acad. Sci. Paris 343(10):679–684, 2006). Lions (http://www.college-de-france.fr/default/EN/all/equ_der/audio_video.jsp, 2014).

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Notes

  1. see [9] and [6] for a general appraisal.

  2. Gomes also studied discrete (in time) mean field games in [16].

  3. We call \(\lambda \) a control although it is an abuse of terminology since the controls consist in the values of \(\lambda \).

  4. We do not prove any verification theorem. As we obtain a smooth solution in Theorem 1, there is in fact no technical issue.

  5. Matrices \(B^i\)s and \(C^i\)s are transpose of one another.

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Acknowledgments

The author wishes to acknowledge the helpful conversations with Yves Achdou (Université Paris-Diderot), François Delarue (Université Nice Sophia Antipolis), Jean-Michel Lasry (Université Paris-Dauphine) and Pierre-Louis Lions (Collège de France).

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  1. UFR de Mathématiques, Laboratoire Jacques-Louis Lions, Université Paris-Diderot, Avenue de France, 75013, Paris, France

    Olivier Guéant

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  1. Olivier Guéant
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Guéant, O. Existence and Uniqueness Result for Mean Field Games with Congestion Effect on Graphs. Appl Math Optim 72, 291–303 (2015). https://doi.org/10.1007/s00245-014-9280-2

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