arXiv subjects

S. Deldar

Publications and source records attributed to S. Deldar.

3 recordsLinked to original sources

arXiv2022

Monopoles, vortices and their correlations in SU(3) gauge group

Topological defects such as monopoles, vortices and "chains"of the SU(3) gauge group are studied using its SU(2) subgroups. Two appropriate successive gauge transformations are applied to the subgroups to identify the chains of monopoles and vortices. Using the fact that the defects of the subgroups are not independent, the SU(3) defects and the Lagrangian are obtained and compared with the ones provided by Cho decomposition method. By comparing the results with the ones which have been obtained directly for the SU(3) gauge group, the relation and possible interactions between the defects of the subgroups are discussed.

hep-ph↗

arXiv2014

Interaction between multi components vortices at arbitrary distances using a variational method in the Ginzburg-Landau theory

We study the interaction between the vortices in multi components superconductors based on the Jacobs and Rebbi variation method using Ginzburg-Landau theory. With one condensation, we get attraction interaction between the vortices for type I and repulsion for type II superconductors. With two condensation states such as Mg B_{2} superconductors the behavior is quite different. There is attraction at large distances and repulsion when the vortices are close to each other. A stability point at distance 2.7/λ_{1} is obtained. In the case of three condensation states such as iron based superconductors,we see different behavior depending on penetration depth and correlation length. The formation energy of a vortex with three condensation states is larger than the one with one condensation state with comparable penetration and correlation length. We obtain two stability points for the superconductors with three condensation states.

cond-mat.supr-con↗

arXiv2013

A decomposition for SU(2) Yang-Mills fields

Motivated by Abelian dominance, we suppose that the field strength tensor in the low energy limit of the SU(2) Yang-Mills theory is $ G_{μν}=G_{μν} n $, where $ G_{μν} $ is a space-time tensor and $ n $ is a unit vector field which selects the Abelian direction at each space-time point. Based on this form of the field strength tensor, we propose a decomposition for the Yang-Mills field with three degrees of freedom. It seems that by this kind of decompostion, both monopoles and vortices appear at the same time. We have also obtained the Dirac quantization condition with a rescaled electric charge.

hep-th↗