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12 papers · 1 filter
On characteristic initial data for a star orbiting a black hole
Nigel T. Bishop, Roberto Gomez, Luis Lehner +2
We take further steps in the development of the characteristic approach to enable handling the physical problem of a compact self-gravitating object, such as a neutron star, in clo…
Zeno machines and hypercomputation
Petrus H. Potgieter
This paper reviews the Church-Turing Thesis (or rather, theses) with reference to their origin and application and considers some models of "hypercomputation", concentrating on per…
-decomposability of positive maps
Wladyslaw A. Majewski, Marcin Marciniak
The problem of classification of decomposable (in the sense of Stormer) positive maps between matrix algebras is presented. We propose the new notion of "finite" version of decompo…
Antinorms and Radon curves
Horst Martini, Konrad J. Swanepoel
In this paper we consider two notions that have been discovered and rediscovered by geometers and analysts since 1917 up to the present day: Radon curves and antinorms. A Radon cur…
Pure state transformations induced by linear operators
Louis Labuschagne
We generalise Wigner's theorem to its most general form possible for B(h) in the sense of completely characterising those vector state transformations of B(h) that appear as restri…
The in-medium few-body problem
S. A. Sofianos, M. Beyer
We are concerned with few-particle correlations in a fermionic system at finite temperature and density. Within the many-body Green functions formalism the description of correlati…