Growth of beam-plasma instabilities in the presence of background inhomogeneity

Abstract

We explore how inhomogeneity in the background plasma number density alters the growth of electrostatic unstable wavemodes of beam plasma systems. This is particularly interesting for blazar-driven beam-plasma instabilities, which may be suppressed by inhomogeneities in the intergalactic medium as was recently claimed in the literature. Using high resolution Particle-In-Cell simulations with the SHARP code, we show that the growth of the instability is local, i.e., regions with almost homogeneous background density will support the growth of the Langmuir waves, even when they are separated by strongly inhomogeneous regions, resulting in an overall slower growth of the instability. We also show that if the background density is continuously varying, the growth rate of the instability is lower; though in all cases, the system remains within the linear regime longer and the instability is not extinguished. In all cases, the beam loses approximately the same fraction of its initial kinetic energy in comparison to the uniform case at non-linear saturation. Thus, inhomogeneities in the intergalactic medium are unlikely to suppress the growth of blazar-driven beam-plasma instabilities.

arXiv comment10 pages, 6 figures, Accepted by ApJ, comments welcome

References in corpus (15)

• The Cosmological Impact of Luminous TeV Blazars I: Implications of Plasma Instabilities for the Intergalactic Magnetic Field and Extragalactic Gamma-Ray Background
• Relaxation of Blazar Induced Pair Beams in Cosmic Voids
• The Cosmological Impact of Luminous TeV Blazars II: Rewriting the Thermal History of the Intergalactic Medium
• The Lyman-alpha forest in a blazar-heated Universe
• The Cosmological Impact of Luminous TeV Blazars III: Implications for Galaxy Clusters and the Formation of Dwarf Galaxies
• Plasma effects on fast pair beams II. Reactive versus kinetic instability of parallel electrostatic wave
• The Effect of Nonlinear Landau Damping on Ultrarelativistic Beam Plasma Instabilities
• The electrostatic instability for realistic pair distributions in blazar/EBL cascades
• SHARP: A Spatially Higher-order, Relativistic Particle-in-Cell Code
• The Linear Instability of Dilute Ultrarelativistic $e^{\pm }$ Pair Beams
• Importance of resolving the spectral support of beam-plasma instabilities in simulations
• Patchy blazar heating: diversifying the thermal history of the intergalactic medium
• Bow Ties in the Sky I: The Angular Structure of Inverse Compton Gamma-ray Halos in the Fermi Sky
• Particle-in-cell simulations of the relaxation of electron beams in inhomogeneous solar wind plasmas
• Bow Ties in the Sky II: Searching for Gamma-ray Halos in the Fermi Sky Using Anisotropy

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