Pushing down the Rumin complex to conformally symplectic quotients

Abstract

Given a contact manifold $M_#$ together with a transversal infinitesimal automorphism $\xi$, we show that any local leaf space $M$ for the foliation determined by $\xi$ naturally carries a conformally symplectic (cs-) structure. Then we show that the Rumin complex on $M_#$ descends to a complex of differential operators on $M$, whose cohomology can be computed. Applying this construction locally, one obtains a complex intrinsically associated to any manifold endowed with a cs-structure, which recovers the generalization of the so-called Rumin-Seshadri complex to the conformally symplectic setting. The cohomology of this more general complex can be computed using the push-down construction.

13 pages v2: added reference [7] to earlier construction of the Rumin-Seshadri complex in a conformally symplectic setting; changed terminonolgy from "locally conformally symplectic" to "conformally symplectic"; some other minor changes; finaly version to appear in Differential Geom. Appl

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• Elliptic complex on the Grassmannian of oriented 2-planes