GRB: magnetic fields, cosmic rays, and emission from first principles?

Abstract

We describe a scenario for large-scale magnetic field generation and particle acceleration in a collisionless collision of cold plasma clouds. A first-principle (i.e. using particles) numerical simulation of this process might be possible. Our scenario is essentially 3D. We argue that {\it large-scale} magnetic fields are not generated in 2D, even in collisionless plasma. We calculate and numerically simulate magnetic field generation by relativistic collisionless Kelvin-Helmholtz instability in 2D. Collisionless tangential discontinuity might be more important than collisionless shock, because tangential discontinuity remains unstable even in the hydro limit, when the shock stabilizes.

5 pages

References in corpus (2)

• Magnetic field evolution in relativistic unmagnetized collisionless shocks
• Vorticity and Magnetic Field Generation from Initial Anisotropy in Ultrarelativistic Gamma-Ray Burst Blastwaves

Cited by in corpus (5)

• Three-Dimensional Relativistic MHD Simulations of the Kelvin-Helmholtz Instability: Magnetic Field Amplification by a Turbulent Dynamo
• Magnetic Field Generation and Particle Energization at Relativistic Shear Boundaries in Collisionless Electron-Positron Plasmas
• Magnetic field generation in a jet-sheath plasma via the kinetic Kelvin-Helmholtz instability
• Radiation from accelerated particles in relativistic jets with shocks, shear-flow, and reconnection
• Macroscopic magnetization of primordial plasma by virial shocks