Correspondence between sonic points of ideal photon gas accretion and photon spheres
Correspondence between sonic points of ideal photon gas accretion and photon spheres
In an accretion of fluid, its velocity may transit from subsonic to supersonic. The point at which such transition occurs is called sonic point and often mathematically special. We consider a steady-state and spherically symmetric accretion problem of ideal photon gas in general static spherically symmetric spacetime neglecting back reaction. …