Low Dimensional Supersymmetries in SUSY Chern-Simons Systems and Geometrical Implications

We study in detail the underlying graded geometric structure of abelian N=2 supersymmetric Chern-Simons theory in $(2+1)$-dimensions. This structure is an attribute of the hidden unbroken one dimensional N=2 supersymmetries that the system also possesses. We establish the result that the geometric structures corresponding to the bosonic and to the fermionic sectors are equivalent fibre bundles over the $(2+1)$-dimensional manifold. Moreover, we find a geometrical answer to the question why some and not all of the fermionic sections are related to a N=2 supersymmetric algebra. Our findings are useful for the quantum theory of Chern-Simons vortices.