Volume 70, Number 3, May 2005
|Page(s)||327 - 333|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||06 April 2005|
The intense radiation gas
Department of Physics, Umeå University - SE-901 87 Umeå, Sweden
2 Centre for Fundamental Physics, Rutherford Appleton Laboratory Chilton Didcot, Oxfordshire, OX11 0QX, UK
3 Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie Ruhr-Universität Bochum - D-44780 Bochum, Germany
Accepted: 18 March 2005
We present a new dispersion relation for photons that are nonlinearly interacting with a radiation gas of arbitrary intensity due to photon-photon scattering. It is found that the photon phase velocity decreases with increasing radiation intensity, and it attains a minimum value in the limit of super-intense fields. By using Hamilton's ray equations, a self-consistent kinetic theory for interacting photons is formulated. The interaction between an electromagnetic pulse and the radiation gas is shown to produce pulse self-compression and nonlinear saturation. Implications of our new results are discussed.
PACS: 42.55.Vc – X- and gamma-ray lasers / 12.20.Ds – Quantum electrodynamics: Specific calculations / 95.30.-k – Fundamental aspects of astrophysics
© EDP Sciences, 2005
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