6 papers
Single-minus gluon tree amplitudes are nonzero
Alfredo Guevara, Alexandru Lupsasca, David Skinner +2
Single-minus tree-level -gluon scattering amplitudes are reconsidered. Often presumed to vanish, they are shown here to be nonvanishing for certain "half-collinear" configuratio…
Reconstructing Relativistic Magnetohydrodynamics with Physics-Informed Neural Networks
Corwin Cheung, Marcos Johnson-Noya, Michael Xiang +2
We construct the first physics-informed neural-network (PINN) surrogates for relativistic magnetohydrodynamics (RMHD) using a hybrid PDE and data-driven workflow. Instead of traini…
New Near Extremal Black Holes and Love Symmetry
Alfredo Guevara, Uri Kol
Rotating and charged black holes are known to exhibit remarkable properties close to extremality, including emergent hidden symmetries and holographic duality to 2D theories. In th…
Generating Hodges' Graviton MHV Formula with an Ward Identity
Alfredo Guevara, Elizabeth Himwich, Noah Miller
Hodges' formula expresses the tree-level all-multiplicity Einstein gravity MHV amplitude as a matrix determinant. In this work, we prove that Hodges' determinant is generated by an…
Gravity From a Color Symmetry II: Celestial Color Kinematics for Mass and Spin
Alfredo Guevara
A realization of gravitational amplitudes based in the large limit of a certain 2d Kac-Moody theory has been recently proposed. We relate this proposal to Color Kinemat…
An Exact Black Hole Scattering Amplitude
Alfredo Guevara, Uri Kol, Huy Tran
General Relativity famously predicts precession of orbital motions in the Schwarzschild metric. In this paper we show that by adding a NUT charge the precession vanishes t…