We review recent progress and future prospects for harnessing powerful tools from
theoretical high-energy physics, such as scattering amplitudes and effective field theory, to …

The parton theory is developed along several lines. We begin by developing quantum
mechanics in the infinite momentum frame. The Galilean analogy is worked out and the use …

Scattering amplitudes have their origin in quantum field theory, but have wide-ranging
applications extending to classical physics. We review a formalism to connect certain …

A bstract We study the variance in the measurement of observables during scattering events,
as computed using amplitudes. The classical regime, characterised by negligible …

The eikonal approximation is an ideal tool to extract classical observables in gauge theory
and gravity directly from scattering amplitudes. Here we consider effective theories of gravity …

The effects of soft gluon brehmsstrahlung on the k⊥ distributions of μ pairs produced in
hadron-hadron collisions are studied using the Block-Nordsiek method. At moderate …

The self-force expansion allows the study of deviations from geodesic motion due to the
emission of radiation and its consequent back-reaction. We investigate this scheme within …

Functional integration is one of the most powerful methods of contempo rary theoretical
physics, enabling us to simplify, accelerate, and make clearer the process of the …

Using a formulation of quantum electrodynamics in the infinite-momentum frame, we
develop a theory to describe the scattering of energetic electrons or photons off an external …

Various approaches to high-energy forward scattering in quantum gravity are compared
using the eikonal approximation. The massless limit of the eikonal is shown to be equivalent …