Abstract
We classify anti-involutions of Lie superalgebra \widehat{\mathcal{SD}} preserving the principal gradation, where \widehat{\mathcal{SD}} is the central extension of the Lie superalgebra of differential operators on the super circle S^{1\mid 1} . We clarify the relations between the corresponding subalgebras fixed by these anti-involutions and subalgebras of \widehat{gl}_{∞|∞} of types OSP and P . We obtain a criterion for an irreducible highest weight module over these subalgebras to be quasifinite and construct free field realizations of a distinguished class of these modules. We further establish dualities between them and certain finite-dimensional classical Lie groups on Fock spaces.
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