Effective Action for High-Energy Scattering in Gravity

TL;DR

This paper derives a multi-Regge effective action directly from linearized gravity, isolating physical components and computing effective vertices relevant for high-energy gravitational scattering.

Contribution

It introduces a novel derivation of the effective action from linearized gravity, clarifying the physical degrees of freedom and interaction vertices for high-energy scattering.

Findings

Derived effective vertices for scattering and particle production.

Separated physical metric fluctuation components.

Provided a new framework for high-energy gravity interactions.

Abstract

The multi-Regge effective action is derived directly from the linearized gravity action. After excluding the redundant field components we separate the fields into momentum modes and integrate over modes which correspond neither to the kinematics of scattering nor to the one of exchanged particles. The effective vertices of scattering and of particle production are obtained as sums of the contributions from the triple and quartic interaction terms and the fields in the effective action are defined in terms of the two physical components of the metric fluctuation.