SPONTANEOUS ELECTROMAGNETIC FLUCTUATIONS in A RELATIVISTIC MAGNETIZED ELECTRON-POSITRON PLASMA
Abstract
Spontaneous fluctuations are a robust phenomenon of plasmas near equilibrium, which does not depend on the existence of instabilities, and their characterization provides valuable information about the role of the relativistic temperatures $T∼ mc^2$ in relativistic regimes. In this paper, we study the broadband spontaneous electromagnetic fluctuations in a relativistic and magnetized pair plasma described by Maxwell–Jüttner distribution functions, based on the fluctuation-dissipation theorem and particle-in-cell simulations. It is shown that the transverse electromagnetic fluctuations are constrained by a temperature-independent critical frequency $ømega _m̊c=sqrt̊Ømega _rc̊^2+(ck)^2$, which separates the collisionless damping regime ($| ømega | łt ømega _rm̊$) from the case where the waves can propagate without damping ($| ømega | gt ømega _rm̊$). Further, relativistic simulations show an excellent agreement between analytical and numerical results. We expect this formalism to contribute to obtaining useful physical information about the state of relativistic plasmas.
Roberto E. Navarro
Assistant Professor
PhD in Sciences w/m Physics | Professor at UdeC | Research on Plasma Physics | Linux User & dog lover | Haven’t watched any Star Wars movie
