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- German Research Centre for Artificial IntelligenceDE125 papers
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8 papers · 2 filters
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…
Instanton Induced Tunneling Amplitude at Excited States with the LSZ Method
J. -G. Zhou, J. -Q. Liang, J. Burzlaff +1
Quantum tunneling between degenerate ground states through the central barrier of a potential is extended to excited states with the instanton method. This extension is achieved wi…
Perturbative approach to the critical behaviour of two-matrix models in the limit N -> infinity
S. Balaska, J. Maeder, W. Ruehl
We construct representations of the Heisenberg algebra by pushing the perturbation expansion to high orders. If the multiplication operators tend to differential operator…
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…
Quantisation of 2D-gravity with Weyl and area-preserving diffeomorphism invariances
J. -G. Zhou, Y. -G. Miao, J. -Q. Liang +2
The constraint structure of 2D-gravity with the Weyl and area-preserving diffeomorphism invariances is analysed in the ADM formulation. It is found that when the area-preserving di…