A naive question:
Are these subjects, i.e. classical GR and QFT in curved spacetime, being worked upon much anymore?
Who is researching this and what are the problems within these fields? Any sources are greatly appreciated.
[Physics] General Relativity research and QFT in curved spacetime
general-relativityqft-in-curved-spacetimequantum-field-theory
Best Answer
There are tons of research going on in the classical general relativity. One particularly active subarea is the so-called "numerical relativity", in which the evolution of the spacetime is simulated in computers.
Another smaller subarea, which I mention here because I'm personally interested in it, is the "fluid-gravity correspondence" which is the study of the hydrodynamic behavior of the spacetime close to the black holes. For example, the Navier-Stokes equation arises naturally as a certain limit of the Einstein equation.