The intense radiation gas
Abstract
We present a new dispersion relation for photons that are nonlinearly interacting with a radiation gas of arbitrary intensity due to photonphoton scattering. It is found that the photon phase velocity decreases with increasing radiation intensity, and it attains a minimum value in the limit of superintense fields. By using Hamilton's ray equations, a selfconsistent kinetic theory for interacting photons is formulated. The interaction between an electromagnetic pulse and the radiation gas is shown to produce pulse selfcompression and nonlinear saturation. Implications of our new results are discussed.
 Publication:

EPL (Europhysics Letters)
 Pub Date:
 May 2005
 DOI:
 10.1209/epl/i2004105030
 arXiv:
 arXiv:hepph/0410203
 Bibcode:
 2005EL.....70..327M
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 7 pages, 1 figure, version to appear in Europhys. Lett