Related by context. Frequent words. (Click for all words.) 66 quantum theory 66 general relativity 66 relativity 65 quantum mechanics 64 Einstein theory 63 cosmological 62 spacetime 61 quantum physics 60 E = mc2 60 theorems 60 Brownian motion 59 quantum gravity 59 physics 59 Einstein 58 Feynman 58 quantum entanglement 57 Richard Feynman 57 astrophysical 57 cosmology 57 quantum mechanical 56 Niels Bohr 56 physicist 56 electromagnetism 56 physicists 56 Johannes Kepler 56 thermodynamics 56 Newtonian 55 gravitational lensing 55 cosmologists 55 dynamical 54 cosmological constant 54 Leibniz 54 theoretical physicist 54 particle physics 54 theorem 54 numerical simulations 53 symmetries 53 galaxy formation 53 Dirac 53 Heisenberg 53 superfluidity 53 singularity 53 differential equations 52 Bose Einstein condensate 52 plate tectonics 52 subatomic particle 52 interferometry 52 thermodynamic 52 supersymmetry 52 relativistic 52 von Neumann 52 mathematician 52 high temperature superconductivity 52 astronomical observations 51 theoretical physicists 51 positron 51 particle physicists 51 gravitational wave 51 Albert Einstein 51 theoretic 51 phenomenological 51 multiverse 51 simultaneity 51 holography 50 Thermodynamics 50 wormholes 50 cosmic 50 fractals 50 scalar 50 fermions 50 theoretical 50 Rorty 50 gravitation 50 phenomenology 50 magnetar 50 quark gluon plasma 50 Lindzen 50 magnetic fields 50 Fourier 50 mathematical 50 astrophysicists 49 theoretical calculations 49 muon 49 theoretical physics 49 parapsychology 49 gravitational waves 49 high temperature superconductors 49 atomic particles 49 cosmologist 49 mathematicians 49 excitons 49 molecular dynamics 49 fluid dynamics 49 continental drift 49 Mandelbrot 49 Big Bang theory 49 Astrophysicist 49 equations 49 plasmons 49 hermeneutics 48 scanning tunneling microscope