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20 papers · 1 filter
Canonical Transformations in a Higher-Derivative Field Theory
L. V. Belvedere, R. L. P. G. Amaral, N. A. Lemos
It has been suggested that the chiral symmetry can be implemented only in classical Lagrangians containing higher covariant derivatives of odd order. Contrary to this belief, it is…
Excitonic Phase Transition in Electronic Systems
M. A. Continentino, G. M. Japiassu, A. Troper
Although predicted theoretically excitonic phase transitions have never been observed. Recently it has been claimed that they can occur in some strongly correlated materials. We st…
Non-RKKY oscillations of exchange coupling in magnetic multilayers
M. S. Ferreira, J. d'Albuquerque e Castro, D. M. Edwards +1
It is shown how the exchange coupling between two ferromagnetic planes embedded in an infinite non-magnetic metal, regarded as a function of the distance between the planes, may co…
Study of a toy model and its relation to the Hubbard model with infinite range hopping
Flavio S. Nogueira, Enrique V. Anda
A toy model of strongly correlated fermions is studied using Green function and functional integration methods. The model exhibits a metal-insulator transition as the interaction i…
Exact Results of the Bit-String Model for Catastrophic Senescence
T. J. P. Penna, S. Moss de Oliveira
We succeeded in obtaining exact results of the bit-string model of biological aging for populations whose individuals breed only once. These results are in excellent agreement with…
Surface crossover exponent for branched polymers in two dimensions
S L A de Queiroz
Transfer-matrix methods on finite-width strips with free boundary conditions are applied to lattice site animals, which provide a model for randomly branched polymers in a good sol…