Philosophers of physics focus on a loosely connected set of questions about physics in general and specific physical theories. For instance:
- Is there a more fundamental theory which explains why quantum measurements seem to collapse the wave function? Some ideas here.
- In what way can the time-asymmetric laws of thermodynamics be derived (via statistical mechanics) from the time-symmetric laws of classical mechanics?
- Is there such a thing as space-time in which objects have position, or are they just related to each other by distances?
- Is the goal of science merely to produce models that make accurate predictions, or are we able to determine how nature really works?
- What is the right way to use experimental data to test multiverse theories?
- Is quantum field theory a theory of particles or fields (or both)?
Philosopher of Physics Hans Halvorson has some additional advice and resources here.