Relativistic transformation of phase-space distributions

Details Relativistic transformation of phase-space distributions Relativistic transformation of phase-space distributions

2011-05-11

arxiv.org/abs/1105.2120v2

Ann.Geophys.29:1259-1265,2011

Physics

Space Physics

7 pages, paper appeared in Ann Geophys., in the printed version the sums should be replaced by products as here in this arXiv-

Scientific paper

10.5194/anngeo-29-1259-2011

We investigate the transformation of the distribution function in the relativistic case, a problem of interest in plasma when particles with high (relativistic) velocities come into play as for instance in radiation belt physics, in the electron-cyclotron maser radiation theory, in the vicinity of high-Mach number shocks where particles are accelerated to high speeds, and generally in solar and astrophysical plasmas. We show that the phase-space volume element is a Lorentz constant and construct the general particle distribution function from first principles. Application to thermal equilibrium lets us derive a modified version of the isotropic relativistic thermal distribution, the modified J\"uttner distribution corrected for the Lorentz-invariant phase-space volume element. Finally, we discuss the relativistic modification of a number of plasma parameters. Keywords: Relativistic invariance of the one-particle distribution function, J\"uttner distribution, relativistic plasma parameters

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