303 citations · 1.7k across the 28 of their papers we have counts for
28 papers
Classical dynamics from QFT via Stratonovich-Weyl correspondence
Alexander Ochirov, Canxin Shi
We develop a formalism for extracting relativistic classical dynamics from the S-matrix, in which massive bodies are described on phase space while massless radiation is kept in th…
Quantum anomalies from three-point on-shell bootstrap
Hiren Kakkad, Rémy Larue, Alexander Ochirov
We bootstrap quantum anomalies using on-shell techniques in the simplest setting: at three points. The necessary field-theoretic input includes the local or global classical symmet…
Twisted de Rham theory for string double copy in AdS
Hiren Kakkad, Alexander Ochirov, Shijie Zhang
This work is motivated by the recent evidence for a double-copy relationship between open- and closed-string amplitudes in Anti-de Sitter (AdS) space. At present, the evidence has…
Compton Amplitude for Rotating Black Hole from QFT
Lucile Cangemi, Marco Chiodaroli, Henrik Johansson +3
We construct a candidate tree-level gravitational Compton amplitude for a rotating Kerr black hole, for any quantum spin s=0,1/2,1,...,, from which we extract the correspon…
From higher-spin gauge interactions to Compton amplitudes for root-Kerr
Lucile Cangemi, Marco Chiodaroli, Henrik Johansson +3
We develop massive higher-spin theory as a framework for describing dynamics of rotating compact objects, such as Kerr black holes. In this paper, we explore gauge interactions up…
Gravitational partial-wave absorption from scattering amplitudes
Rafael Aoude, Alexander Ochirov
We study gravitational absorption effects using effective on-shell scattering amplitudes. We develop an in-in probability-based framework involving plane- and partial-wave coherent…
Kerr Black Holes From Massive Higher-Spin Gauge Symmetry
Lucile Cangemi, Marco Chiodaroli, Henrik Johansson +3
We propose that the dynamics of Kerr black holes is strongly constrained by the principle of gauge symmetry. We initiate the construction of EFTs for Kerr black holes of any intege…
Chiral approach to massive higher spins
Alexander Ochirov, Evgeny Skvortsov
We propose a new, chiral description for massive higher-spin particles in four spacetime dimensions, which facilitates the introduction of consistent interactions. As proof of conc…
All-multiplicity amplitudes with four massive quarks and identical-helicity gluons
Achilleas Lazopoulos, Alexander Ochirov, Canxin Shi
We explore the on-shell recursion for tree-level scattering amplitudes with massive spinning particles. Based on the factorization structure encoded in the same way by two differen…
Classical observables from coherent-spin amplitudes
Rafael Aoude, Alexander Ochirov
The quantum field-theoretic approach to classical observables due to Kosower, Maybee and O'Connell provides a rigorous pathway from on-shell scattering amplitudes to classical pert…
A worldsheet for Kerr
Alfredo Guevara, Ben Maybee, Alexander Ochirov +2
We show that the Newman-Janis shift property of the exact Kerr solution can be interpreted in terms of a worldsheet effective action. This holds both in gravity, and for the single…
Infrared and transcendental structure of two-loop supersymmetric QCD amplitudes
Gregor Kälin, Gustav Mogull, Alexander Ochirov +1
Using a careful choice of infrared (IR) subtraction scheme, we demonstrate the cancellation of all terms with transcendental weights 0,1,2 from the finite part of the full-color tw…
Multi-Quark Colour Decompositions from Unitarity
Alexander Ochirov, Ben Page
Any loop QCD amplitude at full colour is constructed from kinematic and gauge-group building blocks. In a unitarity-based on-shell framework, both objects can be reconstructed from…
Double copy for massive quantum particles with spin
Henrik Johansson, Alexander Ochirov
The duality between color and kinematics was originally observed for purely adjoint massless gauge theories, and later found to hold even after introducing massive fermionic and sc…
Black-hole scattering with general spin directions from minimal-coupling amplitudes
Alfredo Guevara, Alexander Ochirov, Justin Vines
We study the link between classical scattering of spinning black holes and quantum amplitudes for massive spin- particles. Generic spin orientations of the black holes are consi…
Scattering of Spinning Black Holes from Exponentiated Soft Factors
Alfredo Guevara, Alexander Ochirov, Justin Vines
We provide evidence that the classical scattering of two spinning black holes is controlled by the soft expansion of exchanged gravitons. We show how an exponentiation of Cachazo-S…
Two-loop SQCD amplitudes with external matter from iterated cuts
Gregor Kälin, Gustav Mogull, Alexander Ochirov
We develop an iterative method for constructing four-dimensional generalized unitarity cuts in supersymmetric Yang-Mills (SYM) theory coupled to fundamental matte…
Helicity amplitudes for QCD with massive quarks
Alexander Ochirov
The novel massive spinor-helicity formalism of Arkani-Hamed, Huang and Huang provides an elegant way to calculate scattering amplitudes in quantum chromodynamics for arbitrary quar…
One-loop monodromy relations on single cuts
Alexander Ochirov, Piotr Tourkine, Pierre Vanhove
The discovery of colour-kinematic duality has led to significant progress in the computation of scattering amplitudes in quantum field theories. At tree level, the origin of the du…
Full Colour for Loop Amplitudes in Yang-Mills Theory
Alexander Ochirov, Ben Page
We present a general method to account for full colour dependence Yang-Mills amplitudes at loop level. The method fits most naturally into the framework of multi-loop integrand red…
Perturbative spacetimes from Yang-Mills theory
A. Luna, R. Monteiro, I. Nicholson +4
The double copy relates scattering amplitudes in gauge and gravity theories. In this paper, we expand the scope of the double copy to construct spacetime metrics through a systemat…
A Complete Two-Loop, Five-Gluon Helicity Amplitude in Yang-Mills Theory
Simon Badger, Gustav Mogull, Alexander Ochirov +1
We compute the integrand of the full-colour, two-loop, five-gluon scattering amplitude in pure Yang-Mills theory with all helicities positive, using generalized unitarity cuts. Tre…
Color-Kinematics Duality for QCD Amplitudes
Henrik Johansson, Alexander Ochirov
We show that color-kinematics duality is present in tree-level amplitudes of quantum chromodynamics with massive flavored quarks. Starting with the color structure of QCD, we work…
Scattering amplitudes in gauge theories with and without supersymmetry
Alexander Ochirov
This thesis aims at providing better understanding of the perturbative expansion of gauge theories with and without supersymmetry. At tree level, the BCFW recursion relations are a…