Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems

Nendel M, Röckner M (2019) Center for Mathematical Economics Working Papers; 618.
Bielefeld: Center for Mathematical Economics.

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In this paper we construct the smallest semigroup $\mathscr{S}$ that dominates a given family of linear Feller semigroups. The semigroup $\mathscr{S}$ will be referred to as the semigroup envelope or Nisio semigroup. In a second step we investigate strong continuity properties of the semigroup envelope and show that it is a viscosity solution to a nonlinear abstract Cauchy problem. We derive a condition for the existence of a Markov process under a nonlinear expectation for the case where the state space of the Feller processes is locally compact. The procedure is then applied to numerous examples, in particular nonlinear PDEs that arise from control problems for infinite dimensional Ornstein-Uhlenbeck processes and infinite dimensional Lévy processes.
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Nendel M, Röckner M. Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems. Center for Mathematical Economics Working Papers. Vol 618. Bielefeld: Center for Mathematical Economics; 2019.
Nendel, M., & Röckner, M. (2019). Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems (Center for Mathematical Economics Working Papers, 618). Bielefeld: Center for Mathematical Economics.
Nendel, M., and Röckner, M. (2019). Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems. Center for Mathematical Economics Working Papers, 618, Bielefeld: Center for Mathematical Economics.
Nendel, M., & Röckner, M., 2019. Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems, Center for Mathematical Economics Working Papers, no.618, Bielefeld: Center for Mathematical Economics.
M. Nendel and M. Röckner, Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems, Center for Mathematical Economics Working Papers, vol. 618, Bielefeld: Center for Mathematical Economics, 2019.
Nendel, M., Röckner, M.: Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems. Center for Mathematical Economics Working Papers, 618. Center for Mathematical Economics, Bielefeld (2019).
Nendel, Max, and Röckner, Michael. Upper Envelopes of Families of Feller Semigroups and Viscosity Solutions to a Class of Nonlinear Cauchy Problems. Bielefeld: Center for Mathematical Economics, 2019. Center for Mathematical Economics Working Papers. 618.
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