Suppression of pair beam instabilities in a laboratory analogue of blazar pair cascades
arXiv:2509.09040 · doi:10.1073/pnas.2513365122
Abstract
The generation of dense electron-positron pair beams in the laboratory can enable direct tests of theoretical models of -ray bursts and active galactic nuclei. We have successfully achieved this using ultra-relativistic protons accelerated by the Super Proton Synchrotron at CERN. In the first application of this experimental platform, the stability of the pair beam is studied as it propagates through a metre-length plasma, analogous to TeV -ray induced pair cascades in the intergalactic medium. It has been argued that pair beam instabilities disrupt the cascade, thus accounting for the observed lack of reprocessed GeV emission from TeV blazars. If true this would remove the need for a moderate strength intergalactic magnetic field to explain the observations. We find that the pair beam instability is suppressed if the beam is not perfectly collimated or monochromatic, hence the lower limit to the intergalactic magnetic field inferred from -ray observations of blazars is robust.
References in corpus (22)
- Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars
- A low level of extragalactic background light as revealed by gamma-rays from blazars
- Interpenetrating plasma shells: near-equipartition magnetic field generation and non-thermal particle acceleration
- The Physics of the Intergalactic Medium
- The Cosmological Impact of Luminous TeV Blazars I: Implications of Plasma Instabilities for the Intergalactic Magnetic Field and Extragalactic Gamma-Ray Background
- Search for Spatial Extension in High-Latitude Sources Detected by the Fermi Large Area Telescope
- Progress on Cosmological Magnetic Fields
- Very high energy gamma-ray emission beyond 10 TeV from GRB 221009A
- Gamma-ray induced cascades and magnetic fields in intergalactic medium
- Relativistic Pair Beams from TeV Blazars: A Source of Reprocessed GeV Emission rather than IGM Heating
- Relaxation of Blazar Induced Pair Beams in Cosmic Voids
- Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
- Search for Magnetically Broadened Cascade Emission From Blazars with VERITAS
- Cosmology-independent estimate of the fraction of baryon mass in the IGM from fast radio burst observations
- Gamma-Ray Observational Properties of TeV-Detected Blazars
- Stream instabilities in relativistically hot plasma
- Laboratory realization of relativistic pair-plasma beams
- The role of resonant plasma instabilities in the evolution of blazar induced pair beams
- Axion driven cosmic magneto-genesis during the QCD crossover
- Generating ultra-dense pair beams using 400 GeV/c protons
- Cosmological model-independent constraints on the baryon fraction in the IGM from fast radio bursts and supernovae data
- Kinetic Simulations of the Filamentation Instability in Pair Plasmas