83C20 Classes of solutions; algebraically special solutions, metrics with symmetries for problems in general relativity and gravitational theory 2994
83C27 Lattice gravity, Regge calculus and other discrete methods in general relativity and gravitational theory 739
83C30 Asymptotic procedures (radiation, news functions, \(\mathcal{H} \)-spaces, etc.) in general relativity and gravitational theory 823
83C47 Methods of quantum field theory in general relativity and gravitational theory [See also 81T20] 4035
83C60 Spinor and twistor methods in general relativity and gravitational theory; Newman-Penrose formalism 2172