9 papers
Mini-twistors and the Cotton Double Copy
Mariana Carrillo González, William T. Emond, Nathan Moynihan +2
The double copy relates quantities in gauge, gravity and related theories. A well-known procedure for relating exact classical solutions is the Weyl double copy in four spacetime d…
Scattering Amplitudes and The Cotton Double Copy
William T. Emond, Nathan Moynihan
We construct classical curvature spinors in topologically massive gauge theory and topologically massive gravity, expressed in terms of massive three-particle amplitudes. We show t…
Amplitudes from Coulomb to Kerr-Taub-NUT
William T. Emond, Yu-tin Huang, Uri Kol +2
Electric-magnetic duality, the Newman-Janis shift, and the double copy all act by elementary operations on three-point amplitudes. At the same time, they generate a network of inte…
A larger value for by an evolving gravitational constant
Matteo Braglia, Mario Ballardini, William T. Emond +4
We provide further evidence that a massless cosmological scalar field with a non-minimal coupling to the Ricci curvature of the type alleviates…
Black holes in self-tuning cubic Horndeski cosmology
William T. Emond, Antoine Lehébel, Paul M. Saffin
Observations of neutron star mergers in the late Universe have given significant restrictions to the class of viable scalar-tensor theories. In this paper we construct black holes…
Rotating Black Holes in Cubic Gravity
Daniel J. Burger, William T. Emond, Nathan Moynihan
Using on-shell amplitude methods, we derive a rotating black hole solution in a generic theory of Einstein gravity with additional terms cubic in the Riemann tensor. We give an exp…