Ruffini, R. and Vereshchagin, G. V. (2013) Electron-positron plasma in GRBs and in cosmology. Il nuovo cimento C, 36 (Sup. 1). pp. 255-266. ISSN 1826-9885
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Abstract
Electron-positron plasma is believed to play an imporant role both in the early Universe and in sources of Gamma-Ray Bursts (GRBs). We focus on analogies and differences between physical conditions of electron-positron plasma in the early Universe and in sources of GRBs. We discuss: a) dynamical differences, namely thermal acceleration of the outflow in GRB sources vs. cosmological deceleration; b) nuclear composition differences as synthesis of light elements in the early Universe and possible destruction of heavy elements in GRB plasma; c) different physical conditions during last scattering of photons by electrons. Only during the acceleration phase of the optically thick electron-positron plasma the comoving observer may find it similar to the early Universe. This similarity breaks down during the coasting phase. Reprocessing of nuclear abundances may likely take place in GRB sources. Heavy nuclear elements are then destroyed, resulting mainly in protons with small admixture of helium. Unlike the primordial plasma which recombines to form neutral hydrogen, and emits the Cosmic Microwave Background Radiation, GRB plasma does not cool down enough to recombine.
| Item Type: | Article |
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| Uncontrolled Keywords: | Electron-positron plasmas ; Relativistic plasmas ; Cosmology |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 07 May 2020 17:24 |
| Last Modified: | 07 May 2020 17:24 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/18447 |
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