9 research outputs found
On the Cohomology of the Lie Superalgebra of Contact Vector Fields on
We investigate the first cohomology space associated with the embedding of
the Lie superalgebra \cK(2) of contact vector fields on the (1,2)-dimensional
supercircle in the Lie superalgebra \cS\Psi \cD \cO(S^{1\mid
2}) of superpseudodifferential operators with smooth coefficients. Following
Ovsienko and Roger, we show that this space is ten-dimensional with only even
cocycles and we give explicit expressions of the basis cocycles.Comment: Accepted for publication at the Journal of Nonlinear Mathematical
Physic
Morphisms Cohomology and Deformations of Hom-algebras
The purpose of this paper is to study deformation theory of Hom-associative
algebra morphisms and Hom-Lie algebra morphisms. We introduce a suitable
cohomology and discuss Infinitesimal deformations, equivalent deformations and
obstructions. Moreover, we provide some examples.Comment: 37 page
The Binary Invariant Differential Operators on Weighted Densities on the superspace and Cohomology
Over the -dimensional real superspace, , we classify
-invariant binary differential operators acting on the
superspaces of weighted densities, where is the Lie
superalgebra of contact vector fields. This result allows us to compute the
first differential cohomology of %the Lie superalgebra with
coefficients in the superspace of linear differential operators acting on the
superspaces of weighted densities--a superisation of a result by Feigin and
Fuchs. We explicitly give 1-cocycles spanning these cohomology spaces