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- Instituto Superior TécnicoPT32 papers
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34 papers · 1 filter
Groups that together with any transformation generate regular semigroups or idempotent generated semigroups
Joao Araujo, J. D. Mitchell, Csaba Schneider
Let be a non-invertible transformation of a finite set and let be a group of permutations on that same set. Then $\genset{G, a}\setminus G$ is a subsemigroup, consisting of…
Wormhole geometries in f(R) modified theories of gravity
Francisco S. N. Lobo, Miguel A. Oliveira
In this work, we construct traversable wormhole geometries in the context of f(R) modified theories of gravity. We impose that the matter threading the wormhole satisfies the energ…
On Improving Local Search for Unsatisfiability
David Pereira, Inês Lynce, Steven Prestwich
Stochastic local search (SLS) has been an active field of research in the last few years, with new techniques and procedures being developed at an astonishing rate. SLS has been tr…
Four-body continuum-discretized coupled-channels calculations
M. Rodriguez-Gallardo, J. M. Arias, J. Gomez-Camacho +3
The development of a continuum-bins scheme of discretization for three-body projectiles is necessary for studies of reactions of Borromean nuclei such as 6He within the continuum-d…
Dark matter in minimal supergravity with type-II seesaw
J. N. Esteves, M. Hirsch, S. Kaneko +2
We calculate the relic density of the lightest neutralino in a supersymmetric seesaw type-II (``triplet seesaw'') model with minimal supergravity boundary conditions at the GUT sca…
Long lived matter waves Bloch oscillations and dynamical localization by time dependent nonlinearity management
Yuliy V. Bludov, Vladimir V. Konotop, Mario Salerno
We introduce a new method to achieve long lived Bloch oscillations and dynamical localization of matter wave gap solitons in optical lattices. The method is based on time dependent…