title: Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma.
abstract: Stimulated Brillouin backscattering of light is shown to be drastically enhanced in electron-positron plasmas, in contrast to the suppression of stimulated Raman scattering. A generalized theory of three-wave coupling between electromagnetic and plasma waves in two-species plasmas with arbitrary mass ratios, confirmed with a comprehensive set of particle-in-cell simulations, reveals violations of commonly held assumptions about the behavior of electron-positron plasmas. Specifically, in the electron-positron limit three-wave parametric interaction between light and the plasma acoustic wave can occur, and the acoustic wave phase velocity differs from its usually assumed value.
authors.affiliation: Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Edwards
authors.affiliation: Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Nathaniel J
authors.initials: NJ
authors.lastname: Fisch
authors.affiliation: Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.|Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
authors.forename: Julia M
authors.initials: JM
authors.lastname: Mikhailova