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The simple finite Lie superalgebras D(2,1;\alpha), G(3), D(4,1), D(2,2), A(3,1) and F(4) admit D-module representations, given by a set of differential operators of a single real variable t, at a critical value of the scaling dimension \lambda. These superalgebras are one-dimensional N-extended superconformal algebras with N=4 (D(2,1;\alpha)), N=7 (G(3)) and N=8 (the remaining ones). The critical D-module reps induce invariant actions in the Lagrangian framework for superconformal mechanics in D target dimensions. The N=8 critical scalings \lambda=1/(D-4) are linked to the D-dimensional harmonic functions with D=1,2,3,5,6,7,8. This talk is based on J. Math. Phys. 53 (2012) 043513 (arXiv:1112.0995), J. Math. Phys. 53 (2012) 103518 (arXiv:1208.3612) and some extra material.

CRITICAL D-MODULE REPS FOR FINITE SUPERCONFORMAL ALGEBRAS AND THEIR SUPERCONFORMAL MECHANICS