Reduction of $L_{\infty }$-Algebras of Observables on Multisymplectic Manifolds

Abstract

We develop a reduction scheme for the $L_{\infty }$-algebra of observables on a premultisymplectic manifold $(M,\omega )$ in the presence of a compatible Lie algebra action $\mathfrak{g}\curvearrowright M$ and subset $N\subset M$. This reproduces in the symplectic setting the Poisson algebra of observables on the Marsden-Weinstein-Meyer symplectic reduced space, whenever the reduced space exists, but is otherwise distinct from the Dirac, Śniatycki-Weinstein, and Arms-Cushman-Gotay observable reduction schemes. We examine various examples, including multicotangent bundles and multiphase spaces, and we conclude with a discussion of applications to classical field theories and quantization.

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