5,713 research outputs found
Path-ordered Phase Factors in Scalar Quantum Electrodynamics
Starting from linear equations for the complex scalar field, the two- and
three-point Green's functions are obtained in the infrared approximation. We
show that the infrared singularity factorizes in the vertex function as in
spinorial QED, reproducing in a straightforward way the result of lenghty
perturbative calculations.Comment: 11 pages, LaTe
What's Wrong with Pauli-Villars Regularization in ?
In this letter we argue that there is no ambiguity between the Pauli-Villars
and other methods of regularization in (2+1)-dimensional quantum
electrodynamics with respect to dynamical mass generation, provided we properly
choose the couplings for the regulators.Comment: 07 pages, Latex, no figure
The Causal Phase in
The operator in Fock space which describes the scattering and
particle production processes in an external time-dependent electromagnetic
potential can be constructed from the one-particle S-matrix up to a
physical phase . In this work we determine this phase for in
(2+1) dimensions, by means of causality, and show that no ultraviolet
divergences arise, in contrast to the usual formalism of .Comment: LaTex, 11 pages, no figure
Classical solutions in five dimensional induced matter theory and its relation to an imperfect fluid
We study five dimensional cosmological models with four dimensional
hypersufaces of the Bianchi type I and V. In this way the five dimensional
vacuum field equations , led us to four dimensional matter
equations and the matter is interpreted as a purely
geometrical property of a fifth dimension. Also, we find that the
energy-momentum tensor induced from the fifth dimension has the structure of an
imperfect fluid that has dissipative terms.Comment: 16 pages, latex, no figure
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