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70 papers · 1 filter
A Semiregularity Map for Modules and Applications to Deformations
Ragnar-Olaf Buchweitz, Hubert Flenner
This paper contains the details and complete proofs of our earlier announcement in math.AG/9907004 . We construct a general semiregularity map for algebraic cycles as asked for by…
On the twist-3 contribution to h_L in the instanton vacuum
B. Dressler, M. V. Polyakov
We show that the instanton model of the QCD vacuum indicates the parametric smallness of the twist-3 contributions to the polarized structure function h_L. This smallness is relate…
Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting Grains
I. S. Beloborodov, B. N. Narozhny, I. L. Aleiner
We show that in ultra-small superconducting grains any concentration of magnetic impurities or infinitely small orbital effect of magnetic field leads to destruction of the hard ga…
A Remark on the Optimal Cloning of An N-Level Quantum System
Sergio Albeverio, Shao-Ming Fei
We study quantum cloning machines (QCM) that act on an unknown N-level quantum state and make M copies. We give a formula for the maximum of the fidelity of cloning and exhibit the…
Correlated random band matrices: localization-delocalization transitions
Martin Janssen, Krystian Pracz
We study the statistics of eigenvectors in correlated random band matrix models. These models are characterized by two parameters, the band width B(N) of a Hermitian N times N matr…
Statistics of Wave Functions in Coupled Chaotic Systems
A. Tschersich, K. B. Efetov
Using the supersymmetry technique, we calculate the joint distribution of local densities of electron wavefunctions in two coupled disordered or chaotic quantum billiards. We find…