146 citations · 631 across the 23 of their papers we have counts for
24 papers
Thermal Giant Graviton Expansion
Kasia Budzik, Atul Sharma
We construct giant graviton expansions of the thermal and -graded partition functions of and super Yang-Mills theories at zero 't Hooft coup…
Schwarzschild black holes from twistor space
Tim Adamo, Bernardo Araneda, Sean Seet +1
Twistor theory forms the basis for many surprising advances in areas ranging from dynamical systems to quantum field theory. Yet for almost fifty years, one of the main drawbacks o…
Graviton scattering on self-dual black holes
Tim Adamo, Giuseppe Bogna, Lionel Mason +1
The computation of gravitational wave scattering on black hole spacetimes is an extremely hard problem, typically requiring approximation schemes that either treat the black hole p…
S-algebra in Gauge Theory: Twistor, Spacetime and Holographic Perspectives
Adam Kmec, Lionel Mason, Romain Ruzziconi +1
The celestial -algebra arose from a reinterpretation of collinear limits of the Yang-Mills S-matrix as OPEs in celestial holography. It was subsequently represented via asymptot…
Chiral higher-spin theories from twistor space
Lionel Mason, Atul Sharma
We reformulate chiral higher-spin Yang-Mills and gravity on as 'CR-holomorphic' theories of Chern-Simons type; in the most general case, these are Moyal deformed to…
Gluon scattering on the self-dual dyon
Tim Adamo, Giuseppe Bogna, Lionel Mason +1
The computation of scattering amplitudes in the presence of non-trivial background gauge fields is an important but extremely difficult problem in quantum field theory. In even the…
Scattering on self-dual Taub-NUT
Tim Adamo, Giuseppe Bogna, Lionel Mason +1
We derive exact solutions of massless free field equations and tree-level two-point amplitudes up to spin 2 on self-dual Taub-NUT space-time, as well as on its single copy, the sel…
Burns space and holography
Kevin Costello, Natalie M. Paquette, Atul Sharma
We elaborate on various aspects of our top-down celestial holographic duality wherein the semiclassical bulk spacetime is a 4d asymptotically flat, self-dual Kähler geometry known…
All-order celestial OPE from on-shell recursion
Lecheng Ren, Anders Schreiber, Atul Sharma +1
We determine tree level, all-order celestial operator product expansions (OPEs) of gluons and gravitons in the maximally helicity violating (MHV) sector. We start by obtaining the…
Celestial amplitudes in an ambidextrous basis
Carmen Jorge-Diaz, Sabrina Pasterski, Atul Sharma
We start by constructing a conformally covariant improvement of the celestial light transform which keeps track of the mixing between incoming and outgoing states under finite Lore…
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…
Top-down holography in an asymptotically flat spacetime
Kevin Costello, Natalie M. Paquette, Atul Sharma
We propose a holographic duality for a four dimensional WZW model with target manifold , coupled to scalar-flat Kähler gravity on an asymptotically flat, four dimen…
Quantizing the non-linear graviton
Roland Bittleston, Atul Sharma, David Skinner
We consider holomorphic Poisson-BF theory on twistor space. Classically, this describes self-dual Einstein gravity on space-time, but at the quantum level it is plagued by an anoma…
Graviton scattering in self-dual radiative space-times
Tim Adamo, Lionel Mason, Atul Sharma
The construction of amplitudes on curved space-times is a major challenge, particularly when the background has non-constant curvature. We give formulae for all tree-level graviton…
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…
Celestial Symmetries from Twistor Space
Tim Adamo, Lionel Mason, Atul Sharma
We explain how twistor theory represents the self-dual sector of four dimensional gravity in terms of the loop group of Poisson diffeomorphisms of the plane via Penrose's non-linea…
Ambidextrous light transforms for celestial amplitudes
Atul Sharma
Low multiplicity celestial amplitudes of gluons and gravitons tend to be distributional in the celestial coordinates . We provide a new systematic remedy to this situatio…
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…
Twistor sigma models for quaternionic geometry and graviton scattering
Tim Adamo, Lionel Mason, Atul Sharma
We reformulate the twistor construction for hyper- and quaternion-Kähler manifolds, introducing new sigma models that compute scalar potentials for the geometry. These sigma models…
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…
Gluon scattering on self-dual radiative gauge fields
Tim Adamo, Lionel Mason, Atul Sharma
We present all-multiplicity formulae, derived from first principles in the MHV sector and motivated by twistor string theory for general helicities, for the tree-level S-matrix of…
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.…