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31 papers · 1 filter
Exact Complexity of the Winner Problem for Young Elections
Jörg Rothe, Holger Spakowski, Jörg Vogel
In 1977, Young proposed a voting scheme that extends the Condorcet Principle based on the fewest possible number of voters whose removal yields a Condorcet winner. We prove that bo…
Nested-grid calculations of disk-planet interaction
Gennaro D'Angelo, Thomas Henning, Wilhelm Kley
We study the evolution of embedded protoplanets in a protostellar disk using very high resolution nested-grid computations. This method allows us to perform global simulations of p…
Pole structure of the Hamiltonian -function for a singular potential
H. Falomir, P. A. G. Pisani, A. Wipf
We study the pole structure of the -function associated to the Hamiltonian of a quantum mechanical particle living in the half-line , subject to the singular p…
Poisson Geometry in Constrained Systems
Martin Bojowald, Thomas Strobl
Constrained Hamiltonian systems fall into the realm of presymplectic geometry. We show, however, that also Poisson geometry is of use in this context. For the case that the constra…
Quantum state conversion by cross-Kerr interaction
J. Clausen, L. Knoell, D. -G. Welsch
A generalized Mach-Zehnder-type interferometer equipped with cross-Kerr elements is proposed to convert N-photon truncated single-mode quantum states into (N+1)-mode single-photon…
Effective Theories of Confinement
L. Dittmann, T. Heinzl, A. Wipf
We review some approaches to describe confinement in terms of effective (model) field theories. After a brief discussion of the dual Abelian Higgs model, we concentrate on a lattic…