What did Claudio Bunster Weitzman discover?

Answer 1

Claudio Bunster's first interest in theoretical physics was the problem of radiation reaction in classical electrodynamics, where he found a new splitting of the energy momentum tensor of the electromagnetic field of a classical point charge in two separately conserved pieces. This led to a reinterpretation of the Lorentz-Dirac equation of motion. Then his attention turned to general relativity, where he elucidated the Hamiltonian structure of spacetime, giving a geometrical meaning to the commutation relations of the generators of hypersurface deformations. Among the results of his subsequent research, one may find, for example, significant contributions to: the determination of the role of surface integrals as generators of asymptotic symmetries in general relativity and gauge theories, the understanding of the quantum numbers of a black hole and its thermodynamics, the theory of black holes in lower dimensions, the general theory of constrained systems and its quantization, the dynamic neutralization of the cosmological constant, and the generalization of the notion of electric-magnetic duality to extended objects and higher spins.

http://cecs.cl/website/index.php/en/cecs-researchers/physics/5-claudio-bunster