TIme-dependent neutronics and temperatures (TINTE) is a two-group diffusion code for the study of nuclear and thermal behavior of high temperature reactors. It was developed by Forschungszentrum Jülich in Germany, formally known as KFA (German: Kernforschungsanlage), to investigate HTGRs in 2D (r-Z) geometry.
I am thinking about a situation in general relativity which may be in textbooks but I have not been able to find it. I appreciate that there is the geodesic deviation equation for the world line of an observer and a nearby free-falling particle, but I think I need something different.
So we...