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16 papers · 1 filter
Killing spinor initial data sets
Alfonso García-Parrado Gómez-Lobo, Juan A. Valiente Kroon
A 3+1 decomposition of the twistor and valence-2 Killing spinor equation is made using the space spinor formalism. Conditions on initial data sets for the Einstein vacuum equations…
Spin polarization in modulation-doped GaAs quantum wires
M. Evaldsson, S. Ihnatsenka, I. V. Zozoulenko
We study spin polarization in a split-gate quantum wire focussing on the effect of a realistic smooth potential due to remote donors. Electron interaction and spin effects are incl…
Hard constraint satisfaction problems have hard gaps at location 1
Peter Jonsson, Andrei Krokhin, Fredrik Kuivinen
An instance of Max CSP is a finite collection of constraints on a set of variables, and the goal is to assign values to the variables that maximises the number of satisfied constra…
Quantum stress in chaotic billiards
K. -F. Berggren, D. N. Maksimov, A. F. Sadreev +3
This article reports on a joint theoretical and experimental study of the Pauli quantum-mechanical stress tensor for open two-dimensional chaotic billiards. In the ca…
GloptiPoly 3: moments, optimization and semidefinite programming
Didier Henrion, Jean Bernard Lasserre, Johan Lofberg
We describe a major update of our Matlab freeware GloptiPoly for parsing generalized problems of moments and solving them numerically with semidefinite programming.
Dynamical laws of superenergy in General Relativity
Alfonso García-Parrado Gómez-Lobo
The Bel and Bel-Robinson tensors were introduced nearly fifty years ago in an attempt to generalize to gravitation the energy-momentum tensor of electromagnetism. This generalizati…