Scientific note
Schwarzschild solution from a Raychaudhuri-Huygens relation
Null-congruences encode the causal structure of spacetime, describing a phase space of radiation channels, whose expansion scalar theta satisfies the Raychaudhuri equation.
Scientific note
Null-congruences encode the causal structure of spacetime, describing a phase space of radiation channels, whose expansion scalar theta satisfies the Raychaudhuri equation.