Spectral Energy Density In A Kerr Nonlinear Blackbody

In a Kerr nonlinear blackbody, a photon blackbody field is a squeezed thermal radiation state. In the blackbody, bare photons with opposite wave vectors and helicities are bound into pairs and unpaired photons are transformed into a different kind of quasiparticle, the nonpolariton. A nonpolariton is a condensate of virtual nonpolar photons, with a bare photon acting as the nucleus of condensation. The propagation velocity of nonpolaritons is a monotonically increasing function of temperature. The nonpolariton system constitutes free thermal radiation in the Kerr nonlinear blackbody. According to the Plank formula, we could derive the spectral energy density and radiation pressure of the thermal radiation in the Kerr nonlinear blackbody, and compare their figures with those of normal blackbody. It has been found that the spectral energy density and radiation pressure of a Kerr nonlinear blackbody are larger than those of a normal blackbody, and there is a regular variety of the spectral energy density and radiation pressure in a Kerr nonlinear blackbody with the change of temperature and frequency.