Kinetics of Photon Radiation off an e^–e⁺‐Plasma Created from the Vacuum in a Strong Laser Field

Abstract

We consider the one-photon annihilation mechanism in a electron -positron quasiparticle plasma (EPP) created from the vacuum in a strong subcritical laser field due to the dynamical Schwinger mechanism. On the basis of a kinetic theory approach we show that the secondary photons have a radiation spectrum proportional to 1/k (flicker noise). This effect is very small for EPP excitations in the optical spectrum but can reach quite observable values in the γ -ray region.

Asymptotic description of finite lifetime effects on the photon emission from a quark-gluon plasma

“…These are kinematically possible in this case since the quarks and antiquarks obtain additional energy by the coupling to the time dependent background field. Similar investigations have been performed in [11][12][13][14][15] on electron-positron pair annihilation into a single photon in the presence of a strong laser field. There the preceding pair creation (and the subsequent annihilation) has been induced by a time dependent electromagnetic background field (see also [16][17][18][19][20]).…”

BBGKY kinetic approach for ane−e+γplasma created from the vacuum in a strong laser-generated electric field: The one-photon annihilation channel

“…In the case of the two-photon annihilation channel the necessity to compensate the mismatch of the type (48) is absent and therefore the photon production rate can be large enough to be observable already in the optical domain. This channel of the EPP annihilation will be investigated separately.…”

“…Therefore, we use here the Markovian approximation (Approximation 5) K(p, p + k, k; t, t ′ ) → K(p, p + k, k; t, t) = K 0 = 4, see Appendix A. Thus there are two sources for compensation of the high-frequency phase (44): the time dependence of the fermion distribution functions f (p, t) and the multiphoton contributions contained in the mismatch (48).…”

“…Since E 0 ≪ E c , one can use the appropriate perturbation theory in order to select the constant component in the photon production rate. The unique source is now the time dependence of the mismatch (48). For E 0 ≪ E c , one can select in the quasi-energy the first order field effect (Approximation 7)…”

“…(74) It is important that a constant component is absent here, because the mismatch (48) could not be compensated in this case by other sources of the time dependence on the r.h.s. of Eq.…”