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5 papers · 1 filter
The saturation of the electron beam filamentation instability by the self-generated magnetic field and magnetic pressure gradient-driven electric field
M E Dieckmann, G Rowlands, I Kourakis +1
Two counter-propagating cool and equally dense electron beams are modelled with particle-in-cell (PIC) simulations. The electron beam filamentation instability is examined in one s…
Artinianness of local cohomology modules
Moharram Aghapournahr, Leif Melkersson
Let be a noetherian ring, $\fa$ an ideal of , and an --module. Some uniform theorems on the artinianness of certain local cohomology modules are proven in a general s…
Boundedness of the gradient of a solution to the Neumann-Laplace problem in a convex domain
Vladimir Maz'ya
It is shown that solutions of the Neumann problem for the Poisson equation in an arbitrary convex -dimensional domain are uniformly Lipschitz. Applications of this result to som…
Kerr Initial data
Alfonso García-Parrado Gómez-Lobo, Juan A. Valiente Kroon
Exploiting a 3+1 analysis of the Mars-Simon tensor, conditions on a vacuum initial data set ensuring that its development is isometric to a subset of the Kerr spacetime are found.…
Approximability Distance in the Space of H-Colourability Problems
Tommy Färnqvist, Peter Jonsson, Johan Thapper
A graph homomorphism is a vertex map which carries edges from a source graph to edges in a target graph. We study the approximability properties of the Weighted Maximum H-Colourabl…