Total yield of electron-positron pairs produced from vacuum in strong electromagnetic fields: validity of the locally constant field approximation
arXiv:2012.10751 · doi:10.1103/PhysRevD.104.076014
Abstract
The widely-used locally constant field approximation (LCFA) can be utilized in order to derive a simple closed-form expression for the total number of particles produced in the presence of a strong electromagnetic field of a general spatio-temporal configuration. A usual justification for this approximate approach is the requirement that the external field vary slowly in space and time. In this investigation, we examine the validity of the LCFA by comparing its predictions to the results obtained by means of exact nonperturbative numerical techniques. To benchmark the LCFA in the regime of small field amplitudes and low frequencies, we employ a semiclassical approach. As a reference, we consider a standing electromagnetic wave oscillating both in time and space as well as two spatially uniform field configurations: Sauter pulse and oscillating electric field. Performing a thorough numerical analysis, we identify the domain of the field parameters where the approximation is well justified. In particular, it is demonstrated that the Keldysh parameter is not a relevant quantity governing the accuracy of the LCFA.
References in corpus (32)
- Worldline Instantons and Pair Production in Inhomogeneous Fields
- Multiple colliding electromagnetic pulses: a way to lower the threshold of pair production from vacuum
- Pair Production from Vacuum at the Focus of an X-Ray Free Electron Laser
- The Quantum Vlasov Equation and its Markov Limit
- Worldline Instantons II: The Fluctuation Prefactor
- Momentum signatures for Schwinger pair production in short laser pulses with a sub-cycle structure
- A quantum kinetic equation for particle production in the Schwinger mechanism
- The Stokes Phenomenon and Schwinger Vacuum Pair Production in Time-Dependent Laser Pulses
- On e^+e^- pair production by a focused laser pulse in vacuum
- Implementing nonlinear Compton scattering beyond the local constant field approximation
- Interference Effects in Schwinger Vacuum Pair Production for Time-Dependent Laser Pulses
- An extended locally constant field approximation for nonlinear Compton scattering
- The Schwinger mechanism revisited
- Improved local-constant-field approximation for strong-field QED codes
- Ramsey Fringes and Time-domain Multiple-Slit Interference from Vacuum
- Effective mass signatures in multiphoton pair production
- Pair Production Beyond the Schwinger Formula in Time-Dependent Electric Fields
- Spin and polarisation dependent LCFA rates for nonlinear Compton and Breit-Wheeler processes
- Multidimensional Worldline Instantons
- Electron-positron pair production in a bifrequent oscillating electric field
- Pulse shape dependence in the dynamically assisted Sauter-Schwinger effect
- Dynamically assisted Schwinger effect beyond the spatially-uniform-field approximation
- Locally-constant field approximation in studies of electron-positron pair production in strong external fields
- Momentum distribution of particles created in space-time-dependent colliding laser pulses
- Electron-positron pair production in external electric fields varying both in space and time
- Pair production in temporally and spatially oscillating fields
- A uniform locally constant field approximation for photon-seeded pair production
- Discrete worldline instantons
- Pulse shape effects on the electron-positron pair production in strong laser fields
- Vacuum instability in slowly varying electric fields
- Landau-Zener-Stückelberg interferometry in pair production from counterpropagating lasers
- Kinetic description of vacuum production in strong electric fields of arbitrary polarization