GR: Actions and Equations

          @misc{ scivideos_PIRSA:16070009,
            doi = {10.48660/16070009},
            url = {https://pirsa.org/16070009},
            author = {Kubiznak, David},
            keywords = {Quantum Fields and Strings, Quantum Gravity, Quantum Information},
            language = {en},
            title = {GR: Actions and Equations},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {jul},
            note = {PIRSA:16070009 see, \url{https://scivideos.org/pirsa/16070009}}
          }