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168 results on '"Schlickeiser, Reinhard"'

152. Relativistic kinetic theory of electromagnetic waves in equilibrium magnetized plasma. General dispersion equations.

Author

Lazar, Marian and Schlickeiser, Reinhard

Subjects
*ELECTROMAGNETIC waves, *KINETIC theory of liquids, *RELATIVISTIC mechanics, *EQUILIBRIUM, *MAXWELL equations, *DISPERSION relations
Abstract

The relativistic kinetic theory of parallel propagating electromagnetic waves in a magnetized equilibrium plasma is presented. On the basis of relativistic Vlasov–Maxwell equations, a general explicit dispersion relation is derived by a correct analytical continuation for all complex frequencies of electromagnetic waves.PACS Nos.: 52.25.Dg, 52.25.Xz, 52.27.Ep, 52.27.Ny, 52.35.Hr, 52.35.Mw, 52.35.Py [ABSTRACT FROM AUTHOR]

Published
2003
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155. Covariant kinetic theory for nonlinear plasma waves interaction

Author

LAZAR, MARIAN and SCHLICKEISER, REINHARD

Abstract

A rigorous and most general covariant kinetic formalism is developed to study the nonlinear-wave interaction in relativistic Vlasov plasmas. The typical nonlinear plasma reaction is a nonlinear current measured by the nonlinear plasma conductivity, and these quantities are derived here on the basis of relativistic Vlasov–Maxwell equations. Knowing the nonlinear plasma conductivity allows us to determine all plasma modes nonlinearly excited in plasma. The general covariant form of nonlinear conductivity is provided first for any value of plasma temperature and for the whole complex frequency plane by a correct analytical continuation. The further analysis is restricted to a correct relativistic particle distribution, which is vanishing for particle speeds greater than the speed of light. In the limit of non-relativistic plasma temperatures, the covariant nonlinear conductivity is significantly different from the standard non-covariant non-relativistic results, which are reached only in the formal limit of an infinitely large speed of light $c \to \infty$.

Published
2006

159. Synchrotron Radiation from Outer Space.

Author

Schlickeiser, Reinhard and Frahm, Ronald

Subjects
*SYNCHROTRON radiation, *ASTROPHYSICS, *ELECTROMAGNETIC waves, *MAGNETIC fields
Abstract

The author reflects on the concept of synchrotron radiation and its developments in the field of astrophysics. It is an electromagnetic radiation released by charged particles that are moving at high speeds in a magnetic field. The movement of charged particles is affected by strong electrical and gravitational fields, making them evident in various spectra.

Published
2006
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168. On the origin of cosmological magnetic fields by plasma instabilities

Author

Reinhard Schlickeiser and Schlickeiser, Reinhard

Subjects
Physics, Jet (fluid), Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Plasma, Astrophysics, Electron, Condensed Matter Physics, Galaxy, Magnetic field, Weibel instability, Magnetization, Nuclear Energy and Engineering, [PHYS.PHYS.PHYS-PLASM-PH] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Gravitational collapse, Astrophysics::Galaxy Astrophysics
Abstract

The existence of magnetic fields is a mandatory requirement for the onset of most nonthermal phenomena in cosmological sources especially gamma-ray burst sources and relativistic jet sources. The processes leading to the magnetization of the intergalactic medium are not yet known. Large-scale structures in the universe, like filaments and sheets of galaxies, evolve by the gravitational collapse of initially overdense regions giving rise to an intense relative motion of fully ionized gaseous matters and strong gaseous shock structures. We investigate analytically and numerically the generation of magnetic fields in the intergalactic medium by Weibel-type instabilities involving interpenetrating electron streams. Because of the hot temperatures of the intergalactic medium the investigation of the Weibel instability is based on the now available covariantly correct dispersion theory of linear waves, and thus improves on the existing non-relativistic treatments in the literature. These primordial Weibel magnetic fields may serve as cosmological seed fields for even stronger magnetic fields in cosmological sources.

Published
2005

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