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This paper establishes results on the existence and uniqueness of solutionsto McKean-Vlasov equations, also called mean-field stochastic differentialequations, in an infinite-dimensional Hilbert space setting with irregulardrift. Here, McKean-Vlasov equations with additive noise are considered wherethe driving noise is cylindrical (fractional) Brownian motion. The existenceand uniqueness of weak solutions are established for drift coefficients thatare merely measurable, bounded, and continuous in the law variable. Inparticular, the drift coefficient is allowed to be singular in the spatialvariable. Further, we discuss existence of a pathwisely unique strong solutionas well as Malliavin differentiability.

McKean-Vlasov equations on infinite-dimensional Hilbert spaces with irregular drift and additive fractional noise