Particle & high-energy physics 22 Quantum physics (quantum mechanics & quantum field theory) 15 Physics 7 Nuclear physics 6 Research & information: general 4 Astronomy, space & time 3 Atomic & molecular physics 3 Mensuration & systems of measurement 3 Algorithms & data structures 2 Computer security 2 Mathematical theory of computation 2 Maths for engineers 2 Business & management 1 Classical mechanics 1 Computer modelling & simulation 1 Computer science 1 Condensed matter physics (liquid state & solid state physics) 1 Earth sciences, geography, environment, planning 1 Economics 1 Film, TV & radio 1 History of science 1 Machine learning 1 Materials science 1 Mathematical physics 1 Mathematics 1 Mechanical engineering 1 Nuclear power & engineering 1 Optical physics 1 Philosophy 1 Philosophy of religion 1