Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630107s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #301.07; Bulletin of the American Astronomical Society, Vol. 41, p.846
Astronomy and Astrophysics
Astronomy
Scientific paper
We report a model for gamma-ray bursts based on emission of
electromagnetic radiation by superluminal (faster than light in vacuo)
polarization currents. It was shown by Nobel laureate Vitaly Ginzburg and colleagues that such superluminal polarization currents both are possible within the framework of Special Relativity (as the constituent charged particles move subluminally) and act as a bona-fide source term in Maxwell's equations. Subsequently this assertion has been proved by numerous laboratory experiments, and superluminal polarization currents are now believed by some to play a dominant role in pulsar emissions. The superluminal gamma-ray burst mechanism occurs when a spherically-expanding shock wave generated by the explosion of the progenitor, and traveling almost at the speed of light, impacts a non-uniform distribution of matter in the neighborhood. Simple geometrical considerations dictate that any charged particles and/or photons accompanying the shockwave will induce a polarization current with a tangential component that both decelerates and moves faster than the speed of light. Currents of a similar geometry have been generated in high-power laser experiments and shown to emit broadband radiation. We find that the radiation from the polarization current naturally exhibits the diverse light curves and time-dependent flux characteristic of gamma-ray-burst observations. The emitted radiation is tightly focused, resulting in an unusual flux-distance relationship; very intense fluxes may be produced at large distances without the need for extreme energetics. Moreover, the focusing gives an explanation for the apparent predominance of very energetic gamma-ray-bursts at larger distances.
Ardavan Arzhang
Ardavan Houshang
Middleditch John
Schmidt Albrecht
Singleton John
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