Decoherent Scattering of Light Particles in a D-Brane Background

TL;DR

This paper investigates how quantum recoil effects in a D-brane background cause entanglement and mixed states in light particle scattering, revealing non-factorizing contributions to the superscattering operator.

Contribution

It introduces a calculation of the asymptotic out state for a second light particle scattering off a D-brane, highlighting quantum recoil effects on entanglement.

Findings

Quantum recoil induces entanglement entropy in scattered particles.

Scattering states become mixed due to D-brane excitations.

Non-factorizing contributions to the superscattering operator are identified.

Abstract

We discuss the scattering of two light particles in a D-brane background. It is known that, if one light particle strikes the D brane at small impact parameter, quantum recoil effects induce entanglement entropy in both the excited D brane and the scattered particle. In this paper we compute the asymptotic `out' state of a second light particle scattering off the D brane at large impact parameter, showing that it also becomes mixed as a consequence of quantum D-brane recoil effects. We interpret this as a non-factorizing contribution to the superscattering operator S-dollar for the two light particles in a Liouville D-brane background, that appears when quantum D-brane excitations are taken into account.