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19 papers · 1 filter
Beyond the Hubbard-I Solution with a One-Pole Self-Energy at Half-Filling with the Moment Approach: Non-Linear Effects
J. J. Rodriguez-Nunez, M. A. de Menezes
We have postulated a single pole for the self-energy, , looking for the consequences on the one-particle Green function, in the Hubbard model. We find…
Nucleon Strange Magnetic Moment and Relativistic Covariance
M. Malheiro, W. Melnitchouk
We calculate the corrections to the strange matrix elements of the nucleon resulting from the breaking of rotational invariance on the light-cone. In the meson cloud model, the str…
Broad Histogram Monte Carlo
P. M. C. de Oliveira, T. J. P. Penna, H. J. Herrmann
We propose a new Monte Carlo technique in which the degeneracy of energy states is obtained with a Markovian process analogous to that of Metropolis used currently in canonical sim…
Improving the Hopfield-Tank approach for the traveling salesman problem
M. Argollo de Menezes, T. J. P. Penna
In this work we revisit the Hopfield-Tank algorithm for the traveling salesman problem (TSP) and report encouraging results, with a different dynamics, that makes the algorithm mor…
Search for an unitary mortality law through a theoretical model for biological ageing
A. Racco, M. Argollo de Menezes, T. J. P. Penna
In this work we check the occurrence of the Azbel assumption of mortality within the framework of a bit string model for biological ageing. We reproduced the observed feature of li…
Real-Space Renormalization Group Study of the Two-dimensional Blume-Capel Model with a Random Crystal Field
N. S. Branco, Beatriz M. Boechat
The phase-diagram of the two-dimensional Blume-Capel model with a random crystal field is investigated within the framework of a real-space renormalization group approximation. Our…