193 citations · 1.4k across the 29 of their papers we have counts for
29 papers
Supersymmetric twists in twistor space and holography
Matheus Balisa, Eduardo Casali
We compute some supersymmetric twists of field theories in twistor space, including the minimal supersymmetric and the chiral algebra twists of supersymmetric self-dual Yang-Mills,…
Celestial Regge theory
Eduardo Casali, Riccardo Giordana Pozzi
Exploiting the analytic properties of scattering amplitudes, we provide an alternative but equivalent definition of the standard Mellin transform used to obtain celestial correlati…
All-order celestial OPE in the MHV sector
Tim Adamo, Wei Bu, Eduardo Casali +1
On-shell kinematics for gluon scattering can be parametrized with points on the celestial sphere; in the limit where these points collide, it is known that tree-level gluon scatter…
The 4d/2d correspondence in twistor space and holomorphic Wilson lines
Wei Bu, Eduardo Casali
We give an explicit realization of the 4d local operator / 2d conformal block correspondence of Costello and Paquette in the case of gauge theories. This is accomplished by lifting…
Celestial Amplitudes as AdS-Witten Diagrams
Eduardo Casali, Walker Melton, Andrew Strominger
Both celestial and momentum space amplitudes in four dimensions are beset by divergences resulting from spacetime translation and sometimes scale invariance. In this paper we consi…
Celestial operator products from the worldsheet
Tim Adamo, Wei Bu, Eduardo Casali +1
We compute the operator product expansions of gluons and gravitons in celestial CFT from the worldsheet OPE of vertex operators of four-dimensional ambitwistor string theories. Rem…
Baby Universes and Worldline Field Theories
Eduardo Casali, Donald Marolf, Henry Maxfield +1
The quantum gravity path integral involves a sum over topologies that invites comparisons to worldsheet string theory and to Feynman diagrams of quantum field theory. However, the…
Celestial double copy from the worldsheet
Eduardo Casali, Atul Sharma
Using the ambitwistor string, we compute tree-level celestial amplitudes for biadjoint scalars, Yang-Mills and gravity to all multiplicities. They are presented in compact CHY-like…
Double Copy for Celestial Amplitudes
Eduardo Casali, Andrea Puhm
Celestial amplitudes which use conformal primary wavefunctions rather than plane waves as external states offer a novel opportunity to study properties of amplitudes with manifest…
Loop amplitudes monodromy relations and color-kinematics duality
Eduardo Casali, Sebastian Mizera, Piotr Tourkine
Color-kinematics duality is a remarkable conjectured property of gauge theory which, together with double copy, is at the heart of a wealth of new developments in scattering amplit…
Monodromy relations from twisted homology
Eduardo Casali, Sebastian Mizera, Piotr Tourkine
We reformulate the monodromy relations of open-string scattering amplitudes as boundary terms of twisted homologies on the configuration spaces of Riemann surfaces of arbitrary gen…
Notes on the pure spinor superparticle
Nathan Berkovits, Eduardo Casali, Max Guillen +1
The pure spinor superparticle has been shown to describe linearized supergravity in a manifestly covariant way. A number of authors have proposed that its correlation…
Plane wave backgrounds and colour-kinematics duality
Tim Adamo, Eduardo Casali, Lionel Mason +1
We obtain the detailed Feynman rules for perturbative gauge theory on a fixed Yang-Mills plane wave background. Using these rules, the tree-level 4-point gluon amplitude is compute…
Ambitwistor string vertex operators on curved backgrounds
Tim Adamo, Eduardo Casali, Stefan Nekovar
We present vertex operators for ambitwistor strings around generic Yang-Mills, gravity and NS-NS backgrounds. The requirement that vertex operators lie in the BRST cohomology of th…
Yang-Mills theory from the worldsheet
Tim Adamo, Eduardo Casali, Stefan Nekovar
We give a new description of classical Yang-Mills theory by coupling a two-dimensional chiral CFT (which gives the tree-level S-matrix of Yang-Mills theory at genus zero) to a back…
Windings of twisted strings
Eduardo Casali, Piotr Tourkine
Twistor string models have been known for more than a decade now but have come back under the spotlight recently with the advent of the scattering equation formalism which has grea…
The complex null string, Galilean conformal algebra and scattering equations
Eduardo Casali, Yannick Herfray, Piotr Tourkine
The scattering equation formalism for scattering amplitudes, and its stringy incarnation, the ambitwistor string, remains a mysterious construction. In this paper, we pursue the st…
Amplitudes on plane waves from ambitwistor strings
Tim Adamo, Eduardo Casali, Lionel Mason +1
In marked contrast to conventional string theory, ambitwistor strings remain solvable worldsheet theories when coupled to curved background fields. We use this fact to consider the…
Scattering on plane waves and the double copy
Tim Adamo, Eduardo Casali, Lionel Mason +1
Perturbatively around flat space, the scattering amplitudes of gravity are related to those of Yang-Mills by colour-kinematic duality, under which gravitational amplitudes are obta…
On the null origin of the ambitwistor string
Eduardo Casali, Piotr Tourkine
In this paper we present the null string origin of the ambitwistor string. Classically, the null string is the tensionless limit of string theory, and so too is the Ambitwistor str…
On tree amplitudes of supersymmetric Einstein-Yang-Mills theory
Tim Adamo, Eduardo Casali, Kai A. Roehrig +1
We present a new formula for all single trace tree amplitudes in four dimensional super Yang-Mills coupled to Einstein supergravity. Like the Cachazo-He-Yuan formula, our expressio…
New Ambitwistor String Theories
Eduardo Casali, Yvonne Geyer, Lionel Mason +2
We describe new ambitwistor string theories that give rise to the recent amplitude formulae for Einstein-Yang-Mills, (Dirac)-Born-Infeld, Galileons and others introduced by Cachazo…
Perturbative gauge theory at null infinity
Tim Adamo, Eduardo Casali
We describe a theory living on the null conformal boundary of four-dimensional Minkowski space, whose states include the radiative modes of Yang-Mills theory. The action of a Kac-M…
Scattering equations, supergravity integrands, and pure spinors
Tim Adamo, Eduardo Casali
The tree-level S-matrix of type II supergravity can be computed in scattering equation form by correlators in a worldsheet theory analogous to a chiral, infinite tension limit of t…