89 citations · 226 across the 16 of their papers we have counts for
16 papers
A simplified model for monopole catalysis of nucleon decay
Y. Brihaye, V. A. Rubakov, D. H. Tchrakian +1
We present a simple model where a nucleon is treated as the Skyrmion, both monopole and Skyrmion are smooth solutions of the classical field equations,the baryon number non-conserv…
't Hooft tensors as Kalb-Ramond fields of generalised monopoles in all odd dimensions: d=3 and d=5
D. H. Tchrakian, F. Zimmerschied
The Kalb-Ramond monopole, as discussed by Nepomechie, is identical with the (singular) Dirac monopole in d=3 dimensions. The latter can be described by the (regular) 't Hooft-Polya…
Sphaleron of a 4 dimensional SO(4) Higgs model
B. Kleihaus, D. H. Tchrakian, F. Zimmerschied
We construct the finite energy path between topologically distinct vacua of a 4 dimensional SO(4) Higgs model which is known to support an instanton, and show that there is a sphal…
Monopole-Skyrmions
B. Kleihaus, D. H. Tchrakian, F. Zimmerschied
A systematic numerical study of the classical solutions to the combined system consisting of the Georgi-Glashow model and the SO(3) gauged Skyrme model is presented. The gauging of…
d dimensional SO(d)-Higgs Models with Instanton and Sphaleron: d=2,3
B. Kleihaus, D. H. Tchrakian, F. Zimmerschied
The Abelian Higgs model and the Georgi-Glashow model in 2 and 3 Euclidean dimensions respectively, support both finite size instantons and sphalerons. The instantons are the famili…
Dilute Instanton Gas of an O(3) Skyrme Model
H. J. W. Mueller-Kirsten, S. -N. Tamarian, D. H. Tchrakian +1
The pure-Skyrme limit of a scale-breaking Skyrmed O(3) sigma model in 1+1 dimensions is employed to study the effect of the Skyrme term on the semiclassical analysis of a field the…
Quantum Tunneling and Phase Transitions in Spin Systems with an Applied Magnetic Field
S. -Y. Lee, H. J. W. Mueller-Kirsten, D. K. Park +1
Transitions from classical to quantum behaviour in a spin system with two degenerate ground states separated by twin energy barriers which are asymmetric due to an applied magnetic…
Periodic Instantons and Quantum-Classical Transitions in Spin Systems
J. -Q. Liang, H. J. W. Mueller-Kirsten, D. K. Park +1
Some models allowing explicit calculation of periodic instantons and evaluation of their action are studied with regard to transitions from classical to quantum behaviour as the te…
Enhancement of Quantum Tunneling for Excited States in Ferromagnetic Particles
J. -Q. Liang, Y. -B. Zhang, H. J. W. Mueller-Kirsten +3
A formula suitable for a quantitative evaluation of the tunneling effect in a ferromagnetic particle is derived with the help of the instanton method. The tunneling between n-th de…
Skyrme Sphalerons of an O(3)-sigma Model and the Calculation of Transition Rates at Finite Temperature
F. Zimmerschied, D. H. Tchrakian, H. J. W. Mueller-Kirsten
The reduced O(3)-sigma model with an O(3)->O(2) symmetry breaking potential is considered with an additional Skyrmionic term, i.e. a totally antisymmetric quartic term in the field…
Quantum Tunneling of Spin Particles in Periodic Potentials with Asymmetric Twin Barriers
J. -Q. Liang, H. J. W. Mueller-Kirsten, Jian-Ge Zhou +2
The tunneling effect of a periodic potential with an asymmetric twin barrier per period is calculated using the instanton method. The model is derived from the Hamiltonian of a sma…
M-branes, anti-M-branes and nonextremal black holes
Jian-Ge Zhou, H. J. W. Mueller-Kirsten, J. -Q. Liang +1
An M-brane and anti-M-brane scheme is proposed to study nonextremal 4D and 5D black holes. The improved nonextremal intersecting M-brane solutions proposed here, involve two sets o…
Batalin-Vilkovisky field-antifield quantisation of fluctuations around classical field configurations
F. Zimmerschied
The Lagrangian field-antifield formalism of Batalin and Vilkovisky (BV) is used to investigate the application of the collective coordinate method to soliton quantisation. It is sh…
Significance of zero modes in path--integral quantization of solitonic theories with BRST invariance
J. -G. Zhou, F. Zimmerschied, J. -Q. Liang +2
The significance of zero modes in the path-integral quantization of some solitonic models is investigated. In particular a Skyrme-like theory with topological vortices in (1+2) dim…
A new look at the RST model
Jian-Ge Zhou, F. Zimmerschied, J. --Q. Liang +1
The RST model is augmented by the addition of a scalar field and a boundary term so that it is well-posed and local. Expressing the RST action in terms of the ADM formulation, the…
BRST invariant approach to quantum mechanical tunneling
Jian-Ge Zhou, F. Zimmerschied, J. -Q. Liang +1
A new approach with BRST invariance is suggested to cure the degeneracy problem of ill defined path integrals in the path-integral calculationof quantum mechanical tunneling effect…