General relativity on a null surface: Hamiltonian formulation in the teleparallel geometry

The Hamiltonian formulation of general relativity on a null surface is esta blished in the teleparallel geometry. No particular conditions on the tetra ds are imposed, like the time gauge condition. By means of a 3+1 decomposit ion the resulting Hamiltonian arises as a completely constrained system. Ho wever, it is structurally different from the standard Arnowitt-Deser-Misner (ADM) type formulation. In this geometrical framework the basic field quan tities are tetrads that transform under the global SO(3, 1) and the torsion tensor.