Squeezed-state radiation in shockwave scattering: QCD-Gravity double copy

TL;DR

This paper explores the quantum properties of gluon and graviton radiation in shockwave scattering, revealing that such radiation can be modeled as generalized squeezed coherent states with significant quantum noise implications.

Contribution

It introduces a novel description of multi-particle gluon and graviton radiation as generalized Susskind-Glogower squeezed states, highlighting the double copy structure and potential for large squeezing effects.

Findings

Gluon and graviton radiation spectra can be described as gSG squeezed states.

Large squeezing parameters are feasible in the physical regime.

Quantum noise in gravitational waves may exceed detector sensitivities.

Abstract

Gluon and graviton radiation in strong field shockwave scattering are described by effective Lipatov vertices, with the graviton Lipatov vertex proportional to the bilinear of its QCD counterpart. We show here that the n-particle gluon radiation spectrum can be described as a generalized Susskind-Glogower (gSG) squeezed coherent state and discuss the properties of such squeezed states. The double copy structure of the radiative frameworks suggests that multi-graviton radiation can be similarly described as a gSG state. We examine the physical parameter space and show that very large squeezing parameters $\sim \ln({\bar n})$ (where ${\bar n}$ is the mean graviton occupancy) are feasible for nearly minimal uncertainty configurations of the gSG state. Quantum noise in the corresponding gravitational wave spectrum is enhanced above the sensitivity of current and future gravitational wave detectors. Our results point to the importance of a comprehensive study of the strong field Lipatov regime of gravitational radiation.