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A number of dynamical systems of physical interest possess field-dependent symplectic forms which degenerate, becoming noninvertible for some particular configurations. Systems as diverse as vortex interactions in fluids [1], and gravitation theories in dimensions d > 4 containing higher powers of curvature in the Lagrangian exhibit this feature (see e.g.… (More)

- Juan Crisóstomo, Samuel Lepe, J. A. Aguilar – Saavedra
- 2004

Motivated by several pieces of evidence, in order to show that extreme black holes cannot be obtained as limits of non-extremal black holes, in this article we calculate explicitly quasinormal modes for Bañados, Teitelboim and Zanelli (BTZ) extremal black hole and we showed that the imaginary part of the frequency is zero. We obtain exact result for the… (More)

In this letter we describe an approach to the current algebra based in the Path Integral formalism. We use this method for abelian and non-abelian quantum field theories in 1+1 and 2+1 dimensions and the correct expressions are obtained. Our results show the independence of the regularization of the current algebras. PACS number: 03.70.+k, 11.40.Ex Typeset… (More)

- Sophie Gosse, Sylvie Sauvaigo, +5 authors Y. J. Bignon
- International journal of oncology
- 1997

Determination of allele sizes? loss of heterozygosity or genetic instability at minisatellite VNTR loci, are routinely performed by the conventional Southern technique. We have investigated the potential use of automated DNA sequencer for the analysis of the H-ras minisatellite. We report the modifications of amplification parameters and electrophoresis… (More)

- Evelyne Lopez-Crapez, Camille Chypre, J. A. Aguilar – Saavedra, J. J. Marchand, Julien Grenier
- Clinical chemistry
- 1997

We have developed a rapid and large-scale method for the detection of K-ras gene mutations in tumors. First, DNA is amplified by an asymmetric PCR; second, the single-strand dinitrophenyl (DNP)-labeled amplified DNA is hybridized specifically to oligonucleotide probes affixed on a tube. Finally, perfectly matched duplexes are easily detected by a monoclonal… (More)

- Odylio D. Aguiar, Ramón Becar, +11 authors Harri Lipsanen
- 2017

In this manuscript, we present the study of elastic properties of InP nanowires with help of scanning probe microscope in advanced PeakForce Tapping regime. The measuring method was developed in order to investigate the Young's modulus of these cone-shaped structures with significant accuracy. The difference in InP elasticity for wurtzite phase and… (More)

Rare top decays t → cγ, t → cg and CKM unitarity Abstract Top flavour-changing neutral decays are extremely suppressed within the Standard Model (SM) by the GIM mechanism, but can reach observable rates in some of its extensions. We compute the branching ratios for t → cγ and t → cg in minimal SM extensions where the addition of a vector-like up or down… (More)

In this letter we describe an approach to the current algebra based in the Path Integral formalism. We use this method for abelian and non-abelian quantum field theories in 1+1 and 2+1 dimensions and the correct expressions are obtained. Our results show the independence of the regularization of the current algebras. PACS number: 03.70.+k, 11.40.Ex Typeset… (More)

- Samuel Lepe, F. J. Méndez, J. A. Aguilar – Saavedra, Lautaro Vergara
- 2005

The absorption cross section for scattering of fermions off an extreme BTZ black hole is calculated. It is shown that, as in the case of scalar particles, an extreme BTZ black hole exhibits a vanishing absorption cross section, which is consistent with the vanishing entropy of such object. Additionally, we give a general argument to prove that the particle… (More)

- Samuel Lepe, J. A. Aguilar – Saavedra, Francisco J García Peña
- 2008

From a modern point of view, we have two main ingredient in order to deal with the current problems of modern cosmology (late acceleration of the universe, cosmological constant problem, etc.). One of this element is the inclusion of extra dimension by means of the warped fifth dimension that were provided a new scheme to solve the hierarchy problem in… (More)