Particle self-bunching in the Schwinger effect in spacetime-dependent electric fields

Area of Science:

• Quantum Electrodynamics (QED)
• High-Energy Physics
• Theoretical Physics

Background:

• The Schwinger effect describes nonperturbative electron-positron pair creation in strong electric fields.
• Previous studies often relied on simplified models or approximations.
• Understanding pair creation dynamics is crucial for high-intensity laser-matter interactions.

Purpose of the Study:

• To investigate the Schwinger effect using the Dirac-Heisenberg-Wigner formalism in 1+1 dimensions.
• To perform the first ab initio calculation of pair creation under a space- and time-dependent electric field pulse.
• To analyze the time evolution of observable quantities like charge and particle number densities.

Main Methods:

• Utilized the Dirac-Heisenberg-Wigner formalism for a nonperturbative approach.
• Employed an ab initio computational method to simulate the Schwinger effect.
• Modeled a simple space- and time-dependent electric field pulse.

Main Results:

• Successfully calculated the time evolution of charge density and particle number density.
• Observed and predicted a novel self-bunching effect of charges in phase space.
• Quantified the total number of created particles throughout the process.

Conclusions:

• The Dirac-Heisenberg-Wigner formalism provides a robust framework for studying the Schwinger effect.
• The spatial and temporal pulse structure significantly influences pair creation dynamics.
• The predicted self-bunching effect offers new insights into quantum vacuum behavior.