Navegação Ciências Exatas e da Terra por Autor "Dillenburg, Darcy"
Resultados 1-7 de 7
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Bifurcations leading to stochasticity in a cyclotron-maser system
(1994) [Artigo de periódico]This paper is concerned with the orbital dynamics of electrons in a cyclotron maser [CO Chen, Phys. Rev. A 46,6654 (1992)] with modulated maser fields. Amplitude modulation is a natural result of wave-particle energy ... -
Charge commutator for any momentum
(1969) [Artigo de periódico]The nucleon matrix elements of the charge commutation relations are considered for arbitrary momentum. The resulting expression is exact. The high-momentum limit reduces to the Alder-Weisberger sum rule. For zero momentum ... -
Coherent and incoherent radiation from free-electron lasers with an axial guide field
(1981) [Artigo de periódico]The spontaneous and induced emission from a free-electron laser is treated for the case in which an axial magnetic field is imposed in addition to the helical, axially periodic wiggler magnetic field. The classes of possible ... -
Collective effects on the operation of free-eletron lasers with an axial guide field
(1982) [Artigo de periódico]The collective interaction in a free-electroii laser with combined helical wiggler and uniform axial guide fields is presented in the linearized regime. The analysis involves a perturbation of the Vlasov-Maxwell equations ... -
Degrees of symmetry in quantum field theories
(1972) [Artigo de periódico]A hierarchy of possible symmetries in quantum field theory is defined, which reaches from a purely mathematical invariance to the conventional physical invariance, including the commonly discussed type of spontaneously ... -
On the electron-muon mass ratio
(1975) [Artigo de periódico]The quantum electrodynamics (QED) of electrons is considered as a theory with a passive dilatation invariance which is perturbed by the electromagnetic coupling to hadrons and muons. A stability criterium is introduced and ... -
Renormalization and gauge invariance in quantum electrodynamics
(1970) [Artigo de periódico]The connection between the field theory and the perturbation expansion of quantum electrodynamics is studied. As a starting point the usual Lagrangian is taken but with bare electron mass and the renormalization constant ...
