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Gravitation and the local symmetry group of space-time
(Kluwer Academic/plenum Publ, 2014)
Defects in conformal field theory
(2016-04-01)
Abstract: We discuss consequences of the breaking of conformal symmetry by a flat or spherical extended operator. We adapt the embedding formalism to the study of correlation functions of symmetric traceless tensors in the ...
Sub-subleading soft gravitons and large diffeomorphisms
(Springer Verlag, 2017)
We present strong evidence that the sub-subleading soft theorem in semiclassical (tree level) gravity discovered by Cachazo and Strominger is equivalent to the conservation of asymptotic charges associated to a new class ...
The S-matrix bootstrap. Part III: higher dimensional amplitudes
(2019-12-01)
We consider constraints on the S-matrix of any gapped, Lorentz invariant quantum field theory in 3+1 dimensions due to crossing symmetry, analyticity and unitarity. We extremize cubic couplings, quartic couplings and ...
Ricci collineations for type B warped space-times
(SABER ULA, 2006)
Super-Poincaré covariant quantization of the superstring
(2000-12-01)
Using pure spinors, the superstring is covariantly quantized. For the first time, massless vertex operators are constructed and scattering amplitudes are computed in a manifestly ten-dimensional super-Poincaré covariant ...