Marginal Role of the Electrostatic Instability in the GeV-scale Cascade Flux from 1ES 0229+200

Mahmoud Alawashra, Ievgen Vovk, Martin Pohl

Relativistic pair beams produced in the intergalactic medium (IGM) by TeV gamma rays from blazars are expected to generate a detectable GeV-scale electromagnetic cascade, yet this…