Experimental Proposal to Test Photon-Photon Scattering in a Blackbody Radiation Cavity

We build a nonreciprocal blackbody concept based on the 2014 work of Linxiao Zhu and Shanhui Fan, who discovered nearly full breakdown of detailed balance in thermal radiation. If a closed isolated cavity uses this material as its inner surface, thermal equilibrium can never be achieved inside the cavity. To resolve this contradiction, we propose the photonphotonscattering hypothesis and design a corresponding experimental test in this paper.