Cartan 1928 vierbein e^a_mu: orthonormal frame field; spin-connection omega^{ab}_mu; basis for fermion coupling to gravity (Dirac in curved spacetime); ADM formalism.
Cartan 1928 vierbein e^a_mu: orthonormal frame field; spin-connection omega^{ab}_mu; basis for fermion coupling to gravity (Dirac in curved spacetime); ADM formalism.