255 research outputs found
Coulomb interaction from the interplay between Confinement and Screening
It has been noticed that confinement effects can be described by the addition
of a term in the Lagrangian density.
We now study the combined effect of such "confinement term" and that of a mass
term. The surprising result is that the interplay between these two terms gives
rise to a Coulomb interaction. Our picture has a certain correspondence with
the quasiconfinement picture described by Giles, Jaffe and de Rujula for QCD
with symmetry breaking.Comment: 9 page
Coulomb's law modification in nonlinear and in noncommutative electrodynamics
We study the lowest-order modifications of the static potential for
Born-Infeld electrodynamics and for the -expanded version of the
noncommutative U(1) gauge theory, within the framework of the gauge-invariant
but path-dependent variables formalism. The calculation shows a long-range
correction (-type) to the Coulomb potential in Born-Infeld
electrodynamics. However, the Coulomb nature of the potential (to order )
is preserved in noncommutative electrodynamics.Comment: 14 pages, 1 figur
Aspects of finite electrodynamics in D=3 dimensions
We study the impact of a minimal length on physical observables for a
three-dimensional axionic electrodynamics. Our calculation is done within the
framework of the gauge-invariant, but path-dependent, variables formalism which
is alternative to the Wilson loop approach. Our result shows that the
interaction energy contains a regularised Bessel function and a linear
confining potential. This calculation involves no theta expansion at all. Once
again, the present analysis displays the key role played by the new quantum of
length.Comment: 12 pages, 2 figures; reference list updated and extended; new
aknowlegments; removed line after eq.(1) erroneously inserte
Remarks on Screening in a Gauge-Invariant Formalism
In this paper we display a direct and physically attractive derivation of the
screening contribution to the interaction potential in the Chiral Schwinger
model and generalized Maxwell-Chern-Simons gauge theory. It is shown that these
results emerge naturally when a correct separation between gauge-invariant and
gauge degrees of freedom is made. Explicit expressions for gauge-invariant
fields are found.Comment: 13 pages, 1 figure, to appear in PR
Note on the dual BRST Symmetry in U(1) Gauge Theory
We analyze the relation between the Lagrangian and Hamiltonian BRST symmetry
generators for a recently proposed two-dimensional symmetry. In particular it
is shown that this symmetry may be obtained from a canonical transformation in
the ghost sector in a gauge independent way.Comment: 12 pages, late
Lorentz Violating Julia-Toulouse Mechanism
We propose a new Lorentz invariant violating extension for the pure photonic
sector of the Standard Model due to the condensation of topological defects in
the context of the Julia-Toulouse mechanism. Possible physical consequences
leading to direct measurable effects over the confining properties of the
elementary particles are explored.Comment: 4 page
Coulomb's law modification driven by a logarithmic electrodynamics
We examine physical aspects for the electric version of a recently proposed
logarithmic electrodynamics, for which the electric field of a point-like
charge is finite at the origin. It is shown that this electrodynamics displays
the vacuum birefringence phenomenon in the presence of external magnetic field.
Afterwards we compute the lowest-order modification to the interaction energy
by means of the gauge-invariant but path-dependent variables formalism. These
are shown to result in a long-range (-type) correction, in addition to a
linear and another logarithmic correction, to the Coulomb potential.Comment: 4 pages. arXiv admin note: text overlap with arXiv:1709.0386
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