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| Paper: |
A Fireworks Model for Gamma-Ray Bursts |
| Volume: |
312, Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era |
| Page: |
445 |
| Authors: |
Longo, F.; Barbiellini, G.; Celotti, A. |
| Abstract: |
The energetics of the long duration GRB phenomenon is compared with models fo a rotating Black Hole (BH) in a strong magnetic field generated by an accreting torus. The GRB energy emission is attributed to a high magnetic field that breaks down the vacuum around the BH and gives origin to an e± fireball. Its subsequent evolution is hypothesised, in analogy with the in-flight decay of an elementary particle, to evolve in two distinct phases. The first one occurs close to the engine and is responsible of energising and collimating the fireball. The second one consists of a radiation dominated expansion, which correspondingly accelerates the relativistic photon-particle fluid and ends at transparency time. An anisotropy in the fireball propagation is thus naturally produced, whose degree depends on the bulk Lorentz factor at the end of the collimation phase. |
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