I unofficially have a PhD place at a great university to study an area of research in Physics that is not *quite* in the area that really interests me. How easily do people "move around" with their research after their PhD? I am interested in Dark Matter, and my PhD would be working on Gamma Ray Astronomy - so still in the region of astroparticle physics. Should I stick with the great university and supervisor in the hope of moving later in my career, or should I get a place at maybe a lesser university, but in the exact area of interest? Thank you for any replies, kop.