Equivalent charge of photons in a very dense quantum plasma

Abstract

Abstract. The equivalent charge of photons in dense unmagnetized and magnetized Fermi plasmas is determined through the plasma physics method. This charge is associated with the polarization of the medium caused by the ponderomotive force of the electromagnetic waves. Relations for the coupling between the electron plasma density perturbation and the radiation fields are derived for unmagnetized and magnetized plasmas, taking into account the quantum force associated with the quantum Bohm potential in dense Fermi plasmas. The effective photon charge is then determined. The effects of the ion motion are also included in the investigation.Astronomical [1-3] and experimental [4] methods allow one to set limits on the hypothetical electric charge of photons. The existence of a small photon charge would result in charge asymmetry of the Universe and would contribute to the observed cosmic microwave background (CMB) anisotropy [5], for example. However, it is possible to define an equivalent electric charge for an intense laser pulse propagating in a plasma [6,7]. The laser pulse can be thought as a packet of photons, each moving with the group velocity of the laser and possessing an effective mass m eff = ω pe /c 2 , where is the Planck constant divided by 2π, ω pe is the electron plasma frequency, and c is the speed of light in vacuum. This is possible due to the fact that electromagnetic radiation with a large spectral width can be described as a gas of photons; in this case, phase effects are negligible and the photons moving through the plasma can be considered as point-like particles. The photon electric charge is associated with the ponderomotive force (radiation pressure) of the photons, which pushes the electrons out of the region occupied by the pulse and causes the polarization of the medium. In a homogeneous plasma, this equivalent charge induces a time-dependent electric field which moves with the photon group velocity and can eventually be measured. There is also evidence that intense magnetic fields are produced during the laser-plasma interactions [8], which can affect the propagation of photons and the transport of energy in plasmas.During the last few decades, there has been a great deal of interest in investigating the nonlinear interactions between powerful lasers and plasmas in the hope of producing a particle accelerator at the highest energies [9]. Recent experimental at https://www.cambridge.org/core/terms. https://doi

Universality of the Dynamic Characteristic Relationship of Electron Correlation in the Two-Photon Double Ionization Process of a Helium-Like System

“…The change of the charge and mass of electron to test the universality of the dynamic characteristic relationship can be understood from the perspective of the equivalent quality and charge, [20,21] although they are fundamental physical constants. Table 2 presents the values of the characteristic time and the Coulomb interaction energy of the ground state for the case that the electron charge is changed from −0.6𝑒 to −1.3𝑒.…”

Universality of the dynamic characteristic relationship of electron correlation in the two-photon double ionization process of a helium-like system

“…The change of the charge and mass of electron to test universality of the dynamic characteristic relationship can be understood from the perspective of the equivalent quality and charge [19,20], although they are fundamental physics constants. Table II presents the values of the characteristic time and the Coulomb interaction energy of the ground state for the case that the electron charge is changed from −0.6e to −1.3e.…”