Relativistic Expansion of Electron-Positron-Photon Plasma Droplets and Photon Emission

TL;DR

This paper models the relativistic expansion of electron-positron-photon plasma droplets using hydrodynamics, predicting gamma-ray flashes and spectral features that could be observed in future laser experiments.

Contribution

It introduces a relativistic hydrodynamic framework for plasma droplet expansion and predicts observable gamma-ray emissions and spectral signatures.

Findings

Predicted gamma-ray flashes from plasma droplet expansion

Broadened 511 keV line as a signature of warm plasma droplets

Relativistic hydrodynamics effectively describes the expansion dynamics

Abstract

The expansion dynamics of hot electron-positron-photon plasma droplets is dealt with within relativistic hydrodynamics. Such droplets, envisaged to be created in future experiments by irradiating thin foils with counter-propagating ultra-intense laser beams, are sources of flashes of gamma radiation. Warm electron-positron plasma droplets may be identified and characterized by a broadened 511 keV line.