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58 papers · 1 filter
Collective decoherence of cold atoms coupled to a Bose-Einstein condensate
M. A. Cirone, G. De Chiara, G. M. Palma +1
We examine the time evolution of cold atoms (impurities) interacting with an environment consisting of a degenerate bosonic quantum gas. The impurity atoms differ from the environm…
Bandwidth, expansion, treewidth, separators, and universality for bounded degree graphs
Julia Böttcher, Klaas P. Pruessmann, Anusch Taraz +1
We establish relations between the bandwidth and the treewidth of bounded degree graphs G, and relate these parameters to the size of a separator of G as well as the size of an exp…
Relativistic RPA in axial symmetry
D. Pena Arteaga, P. Ring
Covariant density functional theory, in the framework of self-consistent Relativistic Mean Field (RMF) and Relativistic Random Phase approximation (RPA), is for the first time appl…
On the Andre motive of certain irreducible symplectic varieties
Ulrich Schlickewei
We show that the Andre motive of an irreducible, symplectic variety, which is deformation equivalent to the Hilbert scheme of points on a K3 surface, is an object the category gene…
Minimizing atomic configurations of short range pair potentials in two dimensions: crystallization in the Wulff shape
Yuen Au Yeung, Gero Friesecke, Bernd Schmidt
We investigate ground state configurations of atomic systems in two dimensions interacting via short range pair potentials. As the number of particles tends to infinity, we show th…
On the definition, stationary distribution and second order structure of positive semidefinite Ornstein--Uhlenbeck type processes
Christian Pigorsch, Robert Stelzer
Several important properties of positive semidefinite processes of Ornstein--Uhlenbeck type are analysed. It is shown that linear operators of the form $X\mapsto AX+XA^{\mathrm{T}}…