Electron-positron pair creation in relativistic shocks - Pair plasma in thermodynamic equilibrium

Physics – General Physics

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Electron-Positron Pairs, Electron-Positron Plasmas, Relativistic Effects, Shock Waves, Thermodynamic Equilibrium, Baryons, Electron-Ion Recombination, Pair Production, Particle Density (Concentration), Plasma Temperature

Scientific paper

The thermodynamics of a relativistic shock wave in which electron-positron pairs are produced in the postshock matter is studied in the temperature range T = (5-1000) x 10 to the 9th K, where the baryons are nonrelativistic and electron-positron pairs are the only leptons created. The postshock matter with pairs in thermodynamic equilibrium is classified according to whether or not the energy density of the radiation (the pairs and the photons) exceeds that of the baryons. The postshock matter without pairs in thermal equilibrium is also considered in the case where it is composed of a relativistic two-temperature electron-ion plasma. The time scales for temperature relaxation, pair production, and cooling are examined to establish the temperature region where such a plasma can exist.

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