## Proceedings of the International School of Physics "Enrico Fermi.", Volume 11N. Zanichelli, 1960 - Nuclear physics |

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Page 18

Dirac equation and contain only

Dirac equation and contain only

**positive**frequencies . For a state with fixed fourmomentum P , it is ( e.g. for spin zero ) ( II.5 ) flor ) oc exp ( iPink ] . The exact meaning of the coordinate x in the o - number wave functions is ...Page 19

2 ) They are local in the sense that they transform

2 ) They are local in the sense that they transform

**positive**and negative frequency parts of the field operators in the same way ( the fields are transformed « as a whole » ) ( * ) . The reason for the second postulate appears to be ...Page 54

1 ) They have only

1 ) They have only

**positive**energy components , which means that one must have ( 53 ) 1 ( p ) 912,9 ) 1 ( 9 ) ( 2 , 1 ) . 2 ) Because of the commutation relations ( 38 ) only their antisymmetric part contributes .### What people are saying - Write a review

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### Contents

GENERALITĄ | 1 |

PARTE PRIMA Problemi teorici | 9 |

PARTE SECONDA Correlazioni angolari polarizzazioni e decadimenti beta | 197 |

4 other sections not shown

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### Common terms and phrases

allowed angle angular assumed calculated charge classical combination completely component connection conservation consider constant contribute correlation corresponding coupling curvature decay defined density dependence derived described determination direction discussed effects electric electromagnetic field electron elementary elements emission energy equations example existence experiment experimental expression factor Fermi field final finds formula function geometrodynamics geometry give given gravitational histories initial interaction invariance known leads limit magnetic mass matrix means measured metric modes momentum neutrino neutron nuclei nucleons observed obtained operators pairs parity particle phase Phys physics polarization possible present principle problem properties purely quantity quantum quantum mechanics radiation ratio reason reference relation relativity requires respect result scattering shown shows solution space spin symmetry Table theory transformation transitions universe vector wave weak zero