Abstract
The propagation of a relativistic electron-positron beam in a magnetized electron-ion plasma is studied, focusing on the polarization of the radiation generated in this case. Special emphasis is laid on investigating the polarization of the generated radiation for a range of beam-plasma parameters, transverse and longitudinal beam sizes, and the external magnetic fields. Our results not only help in understanding the high degrees of circular polarization observed in gamma-ray bursts, but they also help in distinguishing the different modes associated with the filamentation dynamics of the pair beam in laboratory astrophysics experiments.
Highlights
Colliding or interpenetrating plasma flows are widely believed to be present in many astrophysical scenarios such as supernova remnants (SNRs), active galactic nuclei (AGNs), and pulsar wind nebulae (PWNs) in the universe
Afterwards we examine the role of pair-beam spot sizes and longitudinal length on the polarized radiation generation while keeping the Lorentz factor fixed
When the transverse beam size is few tens of c/ωp and it is larger than the longitudinal size, the filamentation of the pair beam is dominated by the WI or CFI mechanisms
Summary
Colliding or interpenetrating plasma flows are widely believed to be present in many astrophysical scenarios such as supernova remnants (SNRs), active galactic nuclei (AGNs), and pulsar wind nebulae (PWNs) in the universe. With the availability of intense lasers, it has been possible to generate colliding flows mimicking the astrophysical scenarios in a laboratory setup These experiments have reported the generation of current filaments and equipartition magnetic field [17,18]. The generation of a relativistic high-density charge-neutral electron-positron plasma in the laboratory has opened up the possibility to investigate the physics of GRBs in laboratory astrophysics experiments [19] In these experiments, the proton radiography technique is primarily employed to investigate the structure of the current filaments and the magnetic field strength [17,18,20]. The proton radiography technique is primarily employed to investigate the structure of the current filaments and the magnetic field strength [17,18,20] This technique has deeply increased our understanding of the physics of interpenetrating plasma flows, the radiation and polarization signatures can further help in understanding the dissipation mechanism at the kinetic scale [15,16]. V we describe the relevance of our studies for the recently observed circular polarization in GRBs
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