6 papers · 1 filter
Celestial 1-form symmetries
Laurent Freidel, Atul Sharma
The -algebra originally arose as a chiral algebra of asymptotic symmetries of Yang-Mills theory. We show that in the self-dual sector of Yang-Mills, the -algebra gets upgrade…
No-Boundary State for Klein Space
Walker Melton, Atul Sharma, Andrew Strominger +1
Analytic continuation from signature Minkowski to signature Klein space has emerged as a useful tool for the understanding of scattering amplitudes and flat space h…
A Celestial Dual for MHV Amplitudes
Walker Melton, Atul Sharma, Andrew Strominger +1
It is shown that a 2D CFT consisting of a central charge Liouville theory, a chiral level one, rank Kac-Moody algebra and a weight free fermion holographically gener…
Soft Algebras for Leaf Amplitudes
Walker Melton, Atul Sharma, Andrew Strominger
Celestial MHV amplitudes are comprised of non-distributional leaf amplitudes associated to an AdS leaf of a foliation of flat spacetime. It is shown here that the leaf amplitud…
Celestial Leaf Amplitudes
Walker Melton, Atul Sharma, Andrew Strominger
Celestial amplitudes may be decomposed as weighted integrals of AdS-Witten diagrams associated to each leaf of a hyperbolic foliation of spacetime. We show, for the Kleinian th…
Conformal Correlators on the Lorentzian Torus
Walker Melton, Atul Sharma, Andrew Strominger
The general form of a 2D conformal field theory (CFT) correlator on a Euclidean Riemann surface, Lorentzian plane or Lorentzian cylinder is well-known. This paper describes the gen…