We show that modular operads are equivalent to modules over a certain simple properad which we call the Brauer properad. Furthermore, we show that, in this setting, the Feynman transform corresponds to the cobar construction for modules of this kind. To make this precise, we extend the machinery of the bar and cobar constructions relative to a twisting morphism to modules over a general properad. This generalizes the classical case of algebras over an operad and might be of independent interest. As an application, we sketch a Koszul duality theory for modular operads.
Keywords: Modular operads, properads, Koszul duality
2020 MSC: 18M85, 18M70
Theory and Applications of Categories, Vol. 38, 2022, No. 40, pp 1538-1607.
Published 2022-12-20.
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