Dynamical Approach to Pair Production from Strong Fields (original) (raw)

Real time particle production in QED and QCD from strong fields and the Back-Reaction problem

arXiv preprint arXiv:0806.1249, 2008

Abstract: We review the history of analytical approaches to particle production from external strong fields in QED and QCD, and numerical studies of the back reaction problem for the electric field in QED. We discuss the formulation of the backreaction problem for the chromoelectric field in QCD both in leading and next to leading order in flavor large-N QCD.

Kinetic Approach to Pair Production in Strong Fields—Two Lessons for Applications to Heavy-Ion Collisions

Particles

The kinetic-equation approach to particle production in strong, time-dependent external fields is revisited and three limiting cases are discussed for different field patterns: the Sauter pulse, a harmonic pulse with a Gaussian envelope, and a Poisson-distributed stochastic field. It is shown that for transient subcritical electric fields E ( t ) a finite residual particle number density n ( ∞ ) would be absent if the field-dependence of the dynamical phase in the Schwinger source term would be neglected. In this case the distribution function of created particles follows the law f ( t ) ∼ E 2 ( t ) . Two lessons for particle production in heavy-ion collisions are derived from this exercise. First: the shorter the (Sauter-type) pulse, the higher the residual density of produced particles. Second: although the Schwinger process in a string-type field produces a non-thermal particle spectrum, a Poissonian distribution of the (fluctuating) strings produces a thermal spectrum with an ap...

Fermion pair production in a strong electric field

1992

The rate of creation of pairs of charged particles in a static and homogeneous external electric field was computed long ago [1—6]. This processhas been used extensively in color-flux-tube models to describe multiparticle production in hadronic collisions [6— 13). A strong color-electric field is assumed to beformed between receding hadronic sources, quarks or hadrons, and quarkantiquark and gluon pairs emerge in the presence of the field by tunneling.