dirac field in a sentence
Examples
- formally gives the equations of motion and the anticommutation relations of the Dirac field, just as the Klein Gordon Lagrangian in an ordinary path integral gives the equations of motion and commutation relations of the scalar field.
- Quarks are massive spin-1 / 2 fermions which carry a color charge whose gauging is the content of QCD . Quarks are represented by Dirac fields in the fundamental representation "'3 "'of the gauge group SU ( 3 ).
- The Penrose theorem guarantees that some sort of geodesic incompleteness occurs inside " any " black hole whenever matter satisfies reasonable energy conditions ( It does not hold for matter described by a super-field, i . e ., the Dirac field ).
- In a new theory, the Dirac field can interact with another field, for example with the electromagnetic field in quantum electrodynamics, and the strength of the interaction is measured by a parameter, in the case of QED it is the bare electron charge, e.
- Roughly speaking, they crudely describe properties common to all ( or almost all ) states of matter and all nongravitational fields which are well-established in physics, while being sufficiently strong to rule out many unphysical " solutions " of the Einstein field equation . ( It does not hold for matter described by a super-field, i . e ., the Dirac field .)
- The attempted interpretation of the Dirac equation as a single-particle equation could not be maintained long, however, and finally it was shown that several of its undesirable properties ( such as negative-energy states ) could be made sense of by reformulating and reinterpreting the Dirac equation as a true field equation, in this case for the quantized " Dirac field " or the " electron field ", with the " negative-energy solutions " pointing to the existence of Walter Gordon . ) All relativistic wave equations that describe spin-zero particles are said to be of the Klein Gordon type.