Publications (7)21.99 Total impact
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ABSTRACT: In the light of $\phi$mapping topological current theory, the structure of cosmic strings are obtained from the Abelian Higgs model, which is an effective description to the brane world cosmic string system. In this topological description of the cosmic string, combining the result of decomposition of U(1) gauge potential, we analytically reach the familiar conclusions that in the brane world scenario the magnetic flux of the cosmic string is quantized and the RR charge of it is screened. 
Article: Modified London Equation, AbrikosovLike Vortices and Knot Solitons in TwoGap Superconductors
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ABSTRACT: We derive the exact modified London equation for the twogap superconductor, compare it with its singlegap counterpart. We show that the vortices in the twogap superconductor are soft (or continuous) core vortices. In particular, we discuss the topological structure of the finite energy vortices (Abrikosovlike vortices), and find that they can be viewed as the incarnation of the baby skyrmion stretched in the third direction. Besides, we point out that the knot soliton in the twogap superconductor is the twisted Abrikosovlike vortex with its two periodic ends connected smoothly. The relation between the magnetic monopoles and the Abrikosovlike vortices is also discussed briefly.  [Show abstract] [Hide abstract]
ABSTRACT: Using the mapping method, we argue that ferromagnetic spintriplet superconductors allow the formation of unstable magnetic monopoles. In particular, we show that the limit points and the bifurcation points of the mapping will serve as the interaction points of these magnetic monopoles.  [Show abstract] [Hide abstract]
ABSTRACT: A class of thick branes in the background of sineGordon kinks with a scalar potential $V(\phi)=p(1+\cos\frac{2\phi}{q})$ was constructed by R. Koley and S. Kar [Classical Quantum Gravity \textbf{22}, 753 (2005)]. In this paper, in the background of the warped geometry, we investigate the issue of localization of spin half fermions on these branes in the presence of two types of scalarfermion couplings: $\eta\bar{\Psi}\phi\Psi$ and $\eta\bar{\Psi}\sin\phi \Psi$. By presenting the massindependent potentials in the corresponding Schr\"{o}dinger equations, we obtain the lowest KaluzaKlein (KK) modes and a continuous gapless spectrum of KK states with $m^2>0$ for both types of couplings. For the Yukawa coupling $\eta\bar{\Psi}\phi\Psi$, the effective potential of the right chiral fermions for positive $q$ and $\eta$ is always positive, hence only the effective potential of the left chiral fermions could trap the corresponding zero mode. This is a wellknown conclusion which had been discussed extensively in the literature. However, for the coupling $\eta\bar{\Psi}\sin\phi \Psi$, the effective potential of the right chiral fermions for positive $q$ and $\eta$ is no longer always positive. Although the value of the potential at the location of the brane is still positive, it has a series of wells and barriers on each side, which ensures that the right chiral fermion zero mode could be trapped. Thus we may draw the remarkable conclusion: for positive $\eta$ and $q$, the potentials of both the left and right chiral fermions could trap the corresponding zero modes under certain restrictions.  [Show abstract] [Hide abstract]
ABSTRACT: In this paper, we study localization and mass spectrum of various matter fields on a family of thick brane configurations in a pure geometric Weyl integrable 5dimensional space time, a nonRiemannian modification of 5dimensional KaluzaKlein (KK) theory. We present the shape of the massindependent potential of the corresponding Schr\"{o}dinger problem and obtain the KK modes and mass spectrum, where a special coupling of spinors and scalars is considered for fermions. It is shown that, for a class of brane configurations, there exists a continuum gapless spectrum of KK modes with any $m^2>0$ for scalars, vectors and ones of left chiral and right chiral fermions. All of the corresponding massless modes are found to be normalizable on the branes. However, for a special of brane configuration, the corresponding effective Schr\"{o}dinger equations have modified P\"{o}schlTeller potentials. These potentials suggest that there exist mass gap and a series of continuous spectrum starting at positive $m^2$. There are one bound state for spin one vectors, which is just the normalizable vector zero mode, and two bound KK modes for scalars. The total number of bound states for spin half fermions is determined by the coupling constant $\eta$. In the case of no coupling ($\eta=0$), there are no any localized fermion KK modes including zero modes for both left and right chiral fermions. For positive (negative) coupling constant, the number of bound states of right chiral fermions is one less (more) than that of left chiral fermions. In both cases ($\eta>0$ and $\eta<0$), only one of the zero modes for left chiral fermions and right chiral fermions is bound and normalizable. Comment: 18 pages, 2 figures; V2: 19 pages, 12 figures  [Show abstract] [Hide abstract]
ABSTRACT: This paper has been withdrawn by the author due to the inaccurate result.  [Show abstract] [Hide abstract]
ABSTRACT: In the literatures, several types of thick smooth brane configurations in a pure geometric Weyl integrable 5dimensional space time have been presented. The Weyl geometry is a nonRiemannian modification of 5dimensional KaluzaKlein (KK) theory. All these thick brane solutions preserve 4dimensional Poincar\'e invariance, and some of them break $Z_2$symmetry along the extra dimension. In this paper, we study localization of various matter fields on these pure geometrical thick branes, which also localize the graviton. We present the shape of the potential of the corresponding Schr$\mathrm{\ddot{o}}$dinger problem and obtain the lowest KK mode. It is showed that, for both spin 0 scalars and spin 1 vectors, there exists a continuum gapless spectrum of KK states with $m^2>0$. But only the massless mode of scalars is found to be normalizable on the brane. However, for the massless left or right chiral fermion localization, there must be some kind of Yukawa coupling. For a special coupling, there exist a series of discrete massive KK modes with $m^2 >0$. It is also showed that for a given coupling constant only one of the massless chiral modes is localized on the branes. Comment: 17 pages, 5 figures, accepted by JHEP
Publication Stats
188  Citations  
21.99  Total Impact Points  
Top Journals
Institutions

2008

Lanzhou University
 Institute of Theoretical Physics
Kaolanhsien, Gansu Sheng, China 
Institute of physics china
Peping, Beijing, China
