Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-10-17
Phys.ScriptaT107:239,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, uses revtex4; presented at ITCPP03, Santorini, Greece (2003)
Scientific paper
10.1238/Physica.Topical.107a0023
In quantum electrodynamics, photon-photon scattering can be the result of the exchange of virtual electron-positron pairs. This gives rise to a non-trivial dispersion relation for a single photon moving on a background of electromagnetic fields. Knowledge of the dispersion relation can be transferred, using standard methods, into new insights in the dynamical equations for the photons. Effectively, those equations will contain different types of self-interaction terms, depending on whether the photons are coherent or not. It is shown that coherent photons are governed by a nonlinear Schroedinger type equation, such that the self-interaction terms vanish in the limit of parallel propagating waves. For incoherent photons, a set of fluid equations can determine the evolution of the corresponding radiation gas. In the case of a self-interacting radiation fluid, it is shown that Landau damping can occur.
Brodin Gert
Kant Shukla Padma
Marklund Mattias
Stenflo Lennart
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