The aim of this note is to explore the interplay between eikonal resummation in impact-parameter space and exponentiation infrared divergences momentum for gravity amplitudes describing collisions massive objects. governs classical dynamics relevant two-body problem, its properties are directly linked zero-frequency limit gravitational wave emission spectrum radiation-reaction effects. Combinin...

A bstract We consider the eikonal phase associated with gravitational scattering of a highly energetic light particle off very heavy object in AdS spacetime. simple expression for this follows from WKB approximation to amplitude and has been computed all orders ratio impact parameter Schwarzschild radius particle. The is related deflection angle by usual stationary relation. flat space limit ob...

Starting from the leading soft term of 5-point amplitude, involving a graviton and two Kerr black holes, that factorises into product elastic amplitude without factor, we compute infrared divergent contribution to imaginary part two-loop eikonal. Then, using analyticity crossing symmetry, determine radiative real eikonal it deflection angle for spins aligned orbital angular momentum, loss momen...

Accurate and efficient traveltime calculation is an important topic in seismic imaging. We present a fast-marching eikonal solver in the tetragonal coordinates (3-D) and trigonal coordinates (2-D), tetragonal (trigonal) fast-marching eikonal solver (TFMES), which can significantly reduce the first-order approximation error without greatly increasing the computational complexity. In the trigonal...

We establish a definition of arrival time of a wavefront for a propagating wave in anisotropic media that is initially at rest and where the governing partial differential equation is the anisotropic wave equation. This definition of arrival time is not the same as the one in [8, 12]; it eliminates pathological discontinuities that can occur with the older definition and is still consistent wit...

We present the results of fitting elastic pp differential cross section data at 23.5 ≤ √ s ≤ 62.5 GeV with a novel analytic parametrization for the scattering amplitude. Making use of a fitting method, the errors from the free parameters are propagated to the imaginary part of the eikonal in the momentum transfer space. A novel systematic study of the effects coming from data at large momentum ...

We present here a brief overview of recent models describing the photon-photon cross-section into hadrons. We shall show in detail results from the eikonal minijet model, with and without soft gluon summation.