  By making use of the double-time Green function technique, we study
thermodynamics of a deformed Bose gas, which describes well properties of
density intensive photonic gas and radiation fields of the early universe.
General form of statistical distribution function is obtained. We show
explicitly the expression of the distribution function in some limitation
cases. The free energy, equation of state, specific heat and other
thermodynamic properties of the deformed Bose gas are presented.
