Main Question or Discussion Point
It seems like there is no specific Theoretical Physics major. You can major in Astrophysics, Biophysics, Chemical Physics, Engineering Physics, and just plain Physics. At the master/doctorate level you have to specialize in astrophysics, biophysics, chemical physics, geophysics, material science, nuclear physics, optics, particle physics, or plasma physics. Theoretical Physics isn't listed as a particular field. Can you jump into theoretical physics from any physics discipline (such as astrophysics or particle physics)? And theoretical physicist are employed mainly by universities, correct?