## Elementary Particles and the Laws of Physics: The 1986 Dirac Memorial LecturesDeveloping a theory that seamlessly combines relativity and quantum mechanics, the most important conceptual breakthroughs in twentieth century physics, has proved to be a difficult and ongoing challenge. This book details how two distinguished physicists and Nobel laureates have explored this theme in two lectures given in Cambridge, England, in 1986 to commemorate the famous British physicist Paul Dirac. Given for nonspecialists and undergraduates, the talks transcribed in Elementary Particles and the Laws of Physics focus on the fundamental problems of physics and the present state of our knowledge. Professor Feynman examines the nature of antiparticles, and in particular the relationship between quantum spin and statistics. Professor Weinberg speculates on how Einstein's theory of gravitation might be reconciled with quantum theory in the final law of physics. Highly accessible, deeply thought provoking, this book will appeal to all those interested in the development of modern physics. |

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amplitude angular momentum antiparticle backwards beautiful Bose statistics boson cancel charge q coin coordinates coupling constants described diagram disturbance dynamics Einstein's theory electric charge electron's spin elementary particle equation example exchange fact factor Fermi statistics fermions Feynman final laws finite number formula frame give going half integral spin infinities initial inverse laboratory Lagrangian density laws of physics light cone line integral look loop magnetic monopole mathematics negative contribution negative powers Newton's constant pair production particle behavior Paul Dirac Pauli exclusion principle phase change physicists positron powers of mass produce properties quantity quantized quantum field theory quantum mechanics quantum theory reversal shown in Fig simple space spacelike region spacelike separated spacetime spin and statistics spin one-half spin-zero square standard model Steven Weinberg string theory suppose symmetries theorem theory of gravity things total probability two-dimensional surface units vector zero