HEAD 2003 Meeting
Session 16. Gamma-ray Bursts III
Poster, Sunday-Wednesday, March 23, 2003, Duration of Meeting

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[16.09] A Diamagnetic Relativistic Pulse Origin of Cosmic Gamma-Ray Bursts

E. Liang (Rice University), K. Nishimura (Los Alamos National Laboratory)

Using multi-dimensional Particle-in-Cell (PIC) simulations of collisionless plasmas, we recently discovered a new particle energization mechanism based on the relativistic expansion of a strongly magnetized (plasma thermal energy/magnetic energy < 1) hot (kT~MeV) plasma. For an electron-positron (e+e-) plasma, this mechanism, which we call the diamagnetic relativistic pulse accelerator (DRPA), efficiently converts >80 into the ultra-relativistic directed energy of a small fraction of surface particles. When such PIC simulations are continued to >10000 gyroperiods, key features emerge which resemble the unique signatures of cosmic gamma-ray bursts (GRBs), including their spectra, time profiles and spectral evolution. In this paper we will highlight the key results of these PIC simulations and their astrophysical manifestations.

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Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.