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Multi-overlap simulations of spin glasses
Wolfhard Janke, Bernd A. Berg, Alain Billoire
We present results of recent high-statistics Monte Carlo simulations of the Edwards-Anderson Ising spin-glass model in three and four dimensions. The study is based on a non-Boltzm…
Zero-modes of the QED Neuberger Dirac operator
Bernd A. Berg, Urs M. Heller, Harald Markum +2
We consider compact lattice QED in the quenched approximation. First, we briefly summarize the spectrum of the staggered Dirac operator and its connection with random matrix t…
Generalized Ensemble Simulations for Complex Systems
Bernd A. Berg
The most efficient MC weights for the calculation of physical, canonical expectation values are not necessarily those of the canonical ensemble. The use of suitably generalized ens…
About the Functional Form of the Parisi Overlap Distribution for the Three-Dimensional Edwards-Anderson Ising Spin Glass
Bernd A. Berg, Alain Billoire, Wolfhard Janke
Recently, it has been conjectured that the statistics of extremes is of relevance for a large class of correlated system. For certain probability densities this predicts the charac…
A Regularization of Quantum Gravity
Wolfgang Beirl, Bernd A. Berg
We re-examine results of the Liouville theory and provide arguments that a {\it negative} bare cosmological constant is essential to define two-dimensional quantum gravity. From th…
Exact Zero-Modes of the Compact QED Dirac Operator
Bernd A. Berg, Urs M. Heller, Harald Markum +2
We calculate the low-lying eigenmodes of the Neuberger overlap-Dirac operator for compact lattice QED in the quenched approximation. In the strong coupling phase we find exact…