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- Delfim F. M. Torres4 profiles45 · h 65
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- University of CoimbraPT13 papers
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16 papers · 1 filter
Necessary Optimality Conditions for a Dead Oil Isotherm Optimal Control Problem
Moulay Rchid Sidi Ammi, Delfim F. M. Torres
We study a system of nonlinear partial differential equations resulting from the traditional modelling of oil engineering within the framework of the mechanics of a continuous medi…
Tidal dissipation within hot Jupiters: a new appraisal
Benjamin Levrard, Alexandre Morgado Correia, Gilles Chabrier +3
Eccentricity or obliquity tides have been proposed as the missing energy source that may explain the anomalously large radius of some transiting ``hot Jupiters''. To maintain a non…
Phase diagram of an Ising model with competitive interactions on a Husimi tree and its disordered counterpart
Massimo Ostilli, Farrukh Mukhamedov, José F. F. Mendes
We consider an Ising competitive model defined over a triangular Husimi tree where loops, responsible for an explicit frustration, are even allowed. After a critical analysis of th…
Exact ground state for a class of matrix Hamiltonian models: quantum phase transition and universality in the thermodynamic limit
Massimo Ostilli, Carlo Presilla
By using a recently proposed probabilistic approach, we determine the exact ground state of a class of matrix Hamiltonian models characterized by the fact that in the thermodynamic…
Chirality Groups of Maps and Hypermaps
Antonio Breda d'Azevedo, Gareth Jones, Roman Nedela +1
Although the phenomenon of chirality appears in many investigations of maps and hypermaps no detailed study of chirality seems to have been carried out. Chirality of maps and hyper…
The HARPS search for southern extra-solar planets. IX. mu Ara, a system with four planets
F. Pepe, A. C. M. Correia, M. Mayor +13
The mu Ara planetary system is rather complex: It contains two already known planets, mu Ara b with P=640 days and mu Ara c with P=9.64 days, and a third companion on a wide but st…