Simultaneous creation of electron-positron pairs and photons in Robertson-Walker universes with statically bounded expansion.

Details Simultaneous creation of electron-positron pairs and photons in Robertson-Walker universes with statically bounded expansion. Simultaneous creation of electron-positron pairs and photons in Robertson-Walker universes with statically bounded expansion.

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989scep.book.....l&link_type=abstract

Simultaneous creation of electron-positron pairs and photons in Robertson-Walker universes with statically bounded expansion., b

Physics

2

Scientific paper

Based upon quantum electrodynamics in Robertson-Walker flat universes the author presents a thorough analysis of the creation of mutually interacting electron-positron pairs and photons from vacuum. Therefore he discusses at least qualitatively all processes contributing to the number densities of created particles up to the second order in the coupling constant. For two particular expansion laws with Minkowskian in resp. in and out regions the author obtains exact solutions of the Dirac equation and investigates in detail the process of simultaneous creation of electron-positron pairs and photons and the related attenuation effect for fermionic particles. This is done for electrons and positrons which have non-relativistic momenta at Compton time in rapidly expanding universes. The results are compared with the zeroth-order creation of electron-positron pairs. Despite being smaller by a factor of roughly e20/4π ≍ 1/137, the interacting-particle creation is important mainly as a source of photons even in conformally flat universes.

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