A. El Kaabouchi

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We provide a counterexample to show that the generic form of entropy ∑ = i i p g p S) () (is not always stable against small variation of probability distribution (Lesche stability) even if g is concave function on [0,1] and analytic on ]0,1]. Our conclusion is that the stability of such a generic functional needs more hypotheses on the property of the(More)
Heavy electrons in superconducting materials are widely studied with the Kondo lattice t-J model. Numerical results have shown that the Fermi surface of these correlated particles undergoes a flattening effect according to the coupling degree J. This behaviour is not easy to understand from the theoretical point of view within standard Fermi-Dirac(More)
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