4 papers
Twistor action for general relativity
Atul Sharma
We reformulate Euclidean general relativity without cosmological constant as an action governing the complex structure of twistor space. Extending Penrose's non-linear graviton con…
Descendants in celestial CFT and emergent multi-collinear factorization
Stephen Ebert, Atul Sharma, Diandian Wang
Multi-collinear factorization limits provide a window to study how locality and unitarity of scattering amplitudes can emerge dynamically from celestial CFT, the conjectured hologr…
MHV scattering of gluons and gravitons in chiral strong fields
Tim Adamo, Lionel Mason, Atul Sharma
We present all-multiplicity formulae for the tree-level scattering of gluons and gravitons in the maximal helicity violating (MHV) helicity configuration, calculated in certain chi…
Celestial amplitudes and conformal soft theorems
Tim Adamo, Lionel Mason, Atul Sharma
Scattering amplitudes in dimensions can be expressed in terms of a conformal basis, for which the S-matrix behaves as a CFT correlation function on the celestial -sphere.…