Bose-Einstein Condensation and Intermediate State of the Photon Gas
  Possibility of establishment of equilibrium between the photon and the dense photon bunch is studied. In the case, when the density of plasma does not change, the condition of production of the Bose-Einstein condensate is obtained. It is shown that the inhomogeneity of density of photons leads to a new intermediate state of the photon gas. 
Levan N. Tsintsadze