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- José L. Cortés, Mikhail S. Plyushchay
- 1995

A model-independent formulation of anyons as spinning particles is presented. The general properties of the classical theory of (2+1)-dimensional relativistic fractional spin particles and some properties of their quantum theory are investigated. The relationship between all the known approaches to anyons as spinning particles is established. Some… (More)

- J. L. Cortés
- 1993

A new formulation of fermions based on a second order action is proposed. An analysis of the U(1) anomaly allows us to test the validity of the formalism at the quantum level. This formulation gives a new perspective to the introduction of parity non invariant interactions.

- J M Carmona, J L Cortés, J Gamboa, F Méndez
- 2008

The connection between Lorentz invariance violation and noncommutativity of fields in a quantum field theory is investigated. A new dispersion relation for a free field theory with just one additional noncommutative parameter is obtained. While values for the noncommutative scale much larger than 10 −20 eV −1 are ruled out by the present experimental… (More)

- J M Carmona, J L Cortés, J Gamboa, F Méndez
- 2009

Generalizing the noncommutative harmonic oscillator construction, we propose a new extension of quantum field theory based on the concept of " noncommutative fields ". Our description permits to break the usual particle-antiparticle degeneracy at the dispersion relation level and introduces naturally an ultraviolet and an infrared cutoff. Phenomenological… (More)

- José L. Cortés, Mikhail S. Plyushchay
- 1994

The vector system of linear differential equations for a field with arbitrary fractional spin is proposed using infinite-dimensional half-bounded unitary representations of the SL(2, R) group. In the case of (2j + 1)-dimensional nonunitary representations of that group, 0 < 2j ∈ Z, they are transformed into equations for spin-j fields. A local gauge… (More)

- Gloria Luz Paniagua, Eric Monroy, Raymundo Rodríguez, Salvador Arroniz, Cristina Rodríguez, José Luis Cortés +3 others
- Annals of clinical microbiology and…
- 2009

BACKGROUND
Helicobacter pylori has been strongly associated with chronic gastritis, peptic and duodenal ulcers, and it is a risk factor for gastric cancer. Three major virulence factors of H. pylori have been described: the vacuolating toxin (VacA), the cytotoxin-associated gene product (CagA) and the adhesion protein BabA2. Since considerable geographic… (More)

- José Luis Cortés
- 1997

A general discussion of the renormalization of the quantum theory of a scalar field as an effective field theory is presented. The renormal-ization group equations in a mass independent renormalization scheme allow to identify the possibility to go beyond the renormalizable φ 4 theory without losing its predictive power. It is shown that there is a minimal… (More)

- Mario Atance, José Luis Cortés
- 1996

The structure of the renormalization group equations for the low energy effective theory of gravity coupled to a scalar field is presented. An approximate solution to these equations with a finite number of independent renormalized parameters can be found when the mass scale characteristic of the fluctuations in the geometry is much smaller than the Planck… (More)

- J M Carmona, J L Cortés
- 2000

We consider a Lorentz non-invariant dispersion relation for the neutrino, which would produce unexpected effects with neutrinos of few eV, exactly where the tritium beta-decay anomaly is found. We use this anomaly to put bounds on the violation of Lorentz invariance. We discuss other consequences of this non-invariant dispersion relation in neutrino… (More)

- J. L. Cortés
- 1994

The non-relativistic quantum field theoretic lagrangian which describes an anyon system in the presence of an electromagnetic field is identified. A non-minimal magnetic coupling to the Chern-Simons statistical field as well as to the electromagnetic field together with a direct coupling between both fields are the non trivial ingredients of the lagrangian… (More)