scholarly journals SOME CONSIDERATIONS ABOUT PODOLSKY-AXIONIC ELECTRODYNAMICS

2012 ◽  
Vol 27 (11) ◽  
pp. 1250061 ◽  
Author(s):  
PATRICIO GAETE
Keyword(s):  
Interaction Potential ◽  
Gauge Invariant ◽  
First Order ◽  
Dependent Variables ◽  
Path Dependent

For a Podolsky-axionic electrodynamics, we compute the interaction potential within the structure of the gauge-invariant but path-dependent variables formalism. The result is equivalent to that of axionic electrodynamics from a new noncommutative approach, up to first-order in θ.

scholarly journals REMARKS ON A CHERN–SIMONS-LIKE COUPLING

2011 ◽  
Vol 26 (37) ◽  
pp. 2813-2821
Author(s):  
PATRICIO GAETE
Keyword(s):  
Gauge Theory ◽  
Vector Field ◽  
Static Potential ◽  
Gauge Invariant ◽  
Massive Vector ◽  
Hidden Sector ◽  
Dependent Variables ◽  
Qualitative Nature ◽  
Path Dependent ◽  
Chern Simons

We consider the static quantum potential for a gauge theory which includes a light massive vector field interacting with the familiar U (1) QED photon via a Chern–Simons-like coupling, by using the gauge-invariant, but path-dependent, variables formalism. An exactly screening phase is then obtained, which displays a marked departure of a qualitative nature from massive axionic electrodynamics. The above static potential profile is similar to that encountered in axionic electrodynamics consisting of a massless axion-like field, as well as to that encountered in the coupling between the familiar U (1) QED photon and a second massive gauge field living in the so-called U (1)h hidden-sector, inside a superconducting box.

scholarly journals COULOMB'S LAW MODIFICATION IN NONLINEAR AND IN NONCOMMUTATIVE ELECTRODYNAMICS

2004 ◽  
Vol 19 (20) ◽  
pp. 3427-3437 ◽  
Author(s):  
PATRICIO GAETE ◽  
IVÁN SCHMIDT
Keyword(s):  
Gauge Theory ◽  
Long Range ◽  
Coulomb Potential ◽  
Static Potential ◽  
Gauge Invariant ◽  
Coulomb’S Law ◽  
Dependent Variables ◽  
Path Dependent ◽  
Range Correction ◽  
Coulomb's Law

We study the lowest-order modifications of the static potential for Born–Infeld electrodynamics and for the θ-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 (1/r5-type) to the Coulomb potential in Born–Infeld electrodynamics. However, the Coulomb nature of the potential (to order e2) is preserved in noncommutative electrodynamics.

scholarly journals Remarks on inverse electrodynamics

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
Patricio Gaete ◽  
José A. Helayël-Neto
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Interaction Energy ◽  
Coulomb Potential ◽  
Nonlinear Electrodynamics ◽  
Gauge Invariant ◽  
Dependent Variables ◽  
Path Dependent ◽  
Formula Type ◽  
Bending Of Light

AbstractWe study physical aspects for a new nonlinear electrodynamics (inverse electrodynamics). It is shown that this new electrodynamics displays the vacuum birefringence phenomenon in the presence of external magnetic field, hence we compute the bending of light. Afterwards we compute the lowest-order modification to the interaction energy within the framework of the gauge-invariant but path-dependent variables formalism. Our calculations show that the interaction energy contains a long-range ($${1 \big / {{r^5}}}$$ 1 / r 5 -type) correction to the Coulomb potential.

scholarly journals Remarks on the Static Potential Driven by Vacuum Nonlinearities in D=3 Models

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Patricio Gaete ◽  
José A. Helayël-Neto
Keyword(s):  
Interaction Energy ◽  
Long Range ◽  
Coulomb Potential ◽  
Potential Profile ◽  
Linear Potential ◽  
Static Potential ◽  
Generalized Born ◽  
Gauge Invariant ◽  
Dependent Variables ◽  
Path Dependent

Within the framework of the gauge-invariant, but path-dependent, variables formalism, we study the manifestations of vacuum electromagnetic nonlinearities in D=3 models. For this we consider both generalized Born-Infeld and Pagels-Tomboulis-like electrodynamics, as well as Euler-Heisenberg-like electrodynamics. We explicitly show that generalized Born-Infeld and Pagels-Tomboulis-like electrodynamics are equivalent, where the static potential profile contains a long-range (1/r2-type) correction to the Coulomb potential. Interestingly enough, for Euler-Heisenberg-like electrodynamics the interaction energy contains a linear potential, leading to the confinement of static charges.

scholarly journals BORN–INFELD ELECTRODYNAMICS AND EULER–HEISENBERG-LIKE MODEL: OUTSTANDING EXAMPLES OF THE LACK OF COMMUTATIVITY AMONG QUANTIZED TRUNCATED ACTIONS AND TRUNCATED QUANTIZED ACTIONS

2010 ◽  
Vol 25 (32) ◽  
pp. 5951-5961 ◽  
Author(s):  
ANTONIO ACCIOLY ◽  
PATRICIO GAETE ◽  
JOSÉ A. HELAŸEL-NETO
Keyword(s):  
Magnetic Field ◽  
Static Potential ◽  
Generalized Born ◽  
Gauge Invariant ◽  
Correction Formula ◽  
Text Type ◽  
Dependent Variables ◽  
Path Dependent ◽  
Range Correction ◽  
Constant External Magnetic Field

We calculate the lowest-order corrections to the static potential for both the generalized Born–Infeld electrodynamics and an Euler–Heisenberg-like model, in the presence of a constant external magnetic field. Our analysis is carried out within the framework of the gauge-invariant but path-dependent variables formalism. The calculation reveals a long-range correction ([Formula: see text]-type) to the Coulomb potential for the generalized Born–Infeld electrodynamics. Interestingly enough, in the Euler–Heisenberg-like model, the static potential remains Coulombian. Therefore, contrary to popular belief, the quantized truncated action and the truncated quantized action do not commute at all.

scholarly journals CONFINING POTENTIAL FROM INTERACTING MAGNETIC AND TORSION FIELDS

2010 ◽  
Vol 25 (06) ◽  
pp. 471-478
Author(s):  
PATRICIO GAETE ◽  
JOSÉ A. HELAŸEL-NETO
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Field Strength ◽  
Constant Electric Field ◽  
Static Potential ◽  
Gauge Invariant ◽  
Expectation Value ◽  
Confining Potential ◽  
Dependent Variables ◽  
Path Dependent

Adopting the gauge-invariant but path-dependent variables formalism, we study the coupling of torsion fields with photons in the presence of an external background electromagnetic. We explicitly show that, in the case of a constant electric field strength expectation value, the static potential remains Coulombic, while in the case of a constant magnetic field strength expectation value a confining potential is obtained. This result displays a marked qualitative departure from the usual coupling of axionlike particles with photons in the presence of an external magnetic field.

scholarly journals CONFINEMENT IN THE PRESENCE OF EXTERNAL FIELDS AND AXIONS

2005 ◽  
Vol 20 (05) ◽  
pp. 319-327 ◽  
Author(s):  
P. GAETE ◽  
E. I. GUENDELMAN
Keyword(s):  
Field Strength ◽  
Constant Electric Field ◽  
Scalar Coupling ◽  
Static Potential ◽  
Gauge Invariant ◽  
Expectation Value ◽  
Dependent Variables ◽  
Path Dependent ◽  
Magnetic Strength ◽  
Pseudo Scalar

For a theory with a pseudo-scalar coupling [Formula: see text] and in the case that there is a constant electric or magnetic strength expectation value, we compute the interaction potential within the structure of the gauge-invariant but path-dependent variables formalism. While in the case of a constant electric field strength expectation value the static potential remains Coulombic, in the case of a constant magnetic field strength the potential energy is the sum of a Yukawa and a linear potentials, leading to the confinement of static charges.

scholarly journals COULOMB'S LAW CORRECTIONS FROM A GAUGE-KINETIC MIXING

2011 ◽  
Vol 26 (05) ◽  
pp. 863-871 ◽  
Author(s):  
PATRICIO GAETE ◽  
IVÁN SCHMIDT
Keyword(s):  
Standard Model ◽  
Coulomb Potential ◽  
Wilson Loop ◽  
Quantum Potential ◽  
Gauge Invariant ◽  
Hidden Sector ◽  
The Standard Model ◽  
Dependent Variables ◽  
Path Dependent ◽  
Coulomb's Law

We study the connection or equivalence between two well-known extensions of the Standard Model, that is, for the coupling between the familiar massless electromagnetism U (1) QED and a hidden-sector U (1)h, and axionic electrodynamics. Our discussion is carried out using the gauge-invariant but path-dependent variables formalism, which is an alternative to the Wilson loop approach. When we compute in this way the static quantum potential for the coupling between the familiar massless electromagnetism U (1) QED and a hidden-sector U (1)h, the result of this calculation is a Yukawa correction to the usual static Coulomb potential. Previously,14, we have shown that axionic electrodynamics has a different structure which is reflected in a confining piece. Therefore, both extensions of the Standard Model are not equivalent. Interestingly, when the above calculation is done inside a superconducting box, the Coulombic piece disappears leading to a screening phase.

scholarly journals Breaking the cosmological background degeneracy by two-fluid perturbations in f(R) gravity

2015 ◽  
Vol 24 (07) ◽  
pp. 1550053 ◽  
Author(s):  
Amare Abebe
Keyword(s):  
General Relativity ◽  
Exact Solutions ◽  
Structure Formation ◽  
Background Level ◽  
Cosmological Perturbations ◽  
Gauge Invariant ◽  
First Order ◽  
Cosmological Background ◽  
Theories Of Gravity ◽  
Two Fluid

One of the exact solutions of f(R) theories of gravity in the presence of different forms of matter exactly mimics the ΛCDM solution of general relativity (GR) at the background level. In this work we study the evolution of scalar cosmological perturbations in the covariant and gauge-invariant formalism and show that although the background in such a model is indistinguishable from the standard ΛCDM cosmology, this degeneracy is broken at the level of first-order perturbations. This is done by predicting different rates of structure formation in ΛCDM and the f(R) model both in the complete and quasi-static regimes.

Analysis of Shells of Revolution Subjected to Symmetrical and Nonsymmetrical Loads

1964 ◽  
Vol 31 (3) ◽  
pp. 467-476 ◽  
Author(s):  
A. Kalnins
Keyword(s):  
Direct Integration ◽  
Shells Of Revolution ◽  
Natural Boundary ◽  
First Order ◽  
Rotationally Symmetric ◽  
Dependent Variables ◽  
Method Of Solution ◽  
Natural Boundary Conditions ◽  
Numerical Method Of Solution ◽  
Theory Of Shells

The boundary-value problem of deformation of a rotationally symmetric shell is stated in terms of a new system of first-order ordinary differential equations which can be derived for any consistent linear bending theory of shells. The dependent variables contained in this system of equations are those quantities which appear in the natural boundary conditions on a rotationally symmetric edge of a shell of revolution. A numerical method of solution which combines the advantages of both the direct integration and the finite-difference approach is developed for the analysis of rotationally symmetric shells. This method eliminates the loss of accuracy encountered in the usual application of the direct integration approach to the analysis of shells. For the purpose of illustration, stresses and displacements of a pressurized torus are calculated and detailed numerical results are presented.

Sign in / Sign up

Export Citation Format

Share Document