Chirp effects on pair production in oscillating electric fields with spatial inhomogeneity

Abstract

Dirac-Heisenberg-Wigner formalism is used to study chirp effects on the vacuum pair creation under inhomogeneous electric fields. For rapidly oscillating electric fields, the particle momentum spectrum is sensitive to both of the spatial scale and the chirp parameter, and the external field width has less significant effect for the maximally large chirp. For slowly oscillating electric fields, chirp effects could be identified at large spatial extents and the carrier phase plays a significant role reflecting chirp effects even at small spatial scales. We also notice that, the local density approximation holds for all external field profiles considered in this work at the quasihomogeneous limit allowing one to use arguments from homogeneous scenarios to analyze inhomogeneous results.

Dynamically assisted Schwinger mechanism and chirality production in parallel electromagnetic field

“…A number of aspects of the dynamically assisted Schwinger mechanism have been investigated/clarified within, for example, the worldline instanton formalism [77][78][79], numerical simulations based on the quantum kinetic theory [80,81], and the recently developed perturbation theory in the Furry picture [72,73,[82][83][84][85][86][87]. Examples include optimization of a field profile [88][89][90][91][92][93], momentum distribution [72,73,85,86,[94][95][96][97][98][99][100], finite size effects [101,102], and spatially dependent perturbations [103][104][105][106]. In particular, it was clarified in Refs.…”