Relativistic Electromagnetic Plasma Expansion and Gamma-Ray Bursts

Details Relativistic Electromagnetic Plasma Expansion and Gamma-Ray Bursts Relativistic Electromagnetic Plasma Expansion and Gamma-Ray Bursts

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2204l&link_type=abstract

American Astronomical Society, HEAD meeting #8, #22.04; Bulletin of the American Astronomical Society, Vol. 36, p.947

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Scientific paper

Recent large-scale magnetized plasma simulations with Particle-in-Cell (PIC) codes demonstrated that relativistic electron-positron plasma expansions driven by intense electromagnetic pulses reproduce many unique properties of gamma-ray bursts (GRBs), including their light curves, spectra and spectral evolution (Liang and Nishimura, Phys. Rev. Lett. 92(17), 175005 (2004)). Here we will review the basic physics of this new phenomenon, summarize the scaling relations obtained from PIC simulations, and apply them to GRB data. From these we will extract the Lorentz factor, magnetic field, pair density, and other intrinsic GRB parameters. Implications for GRB progenitors and cosmic ray acceleration will be discussed. Future tests of this model with Swift and GLAST data will be suggested. We will also speculate on the astrophysical settings from which these electromagnetic explosions may occur.

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