Search results for "Modelo"

El modelo cognitivo aplicado a delincuentes institucionalizados: el pensamiento prosocial

1996

Vicente.Garrido@uv.es El modelo cognitivo adquiere con los años mayor protagonismo en el campo de los delincuentes institucionalizados, dando importantes muestras de eficacia, aunque debido a la complejidad del escenario de intervencion —el medio penitenciario—, se empieza a considerar la conveniencía de impulsar programas multirnodales. En este trabajo se presenta la experiencia llevada a cabo en la que fue Prisión Modelo de Valencia y que consistió, básicamente, en la aplicación de un paquete de técnicas de carácter cognitivo, técnicas que constituyen el programa denominado El Pensamiento Prosocial. Los resultados, altamente esperanzadores, convierten el mencionado programa en una eficaz …

El Mediterráneo o la creatividad

2001

Improved unitarized heavy baryon chiral perturbation theory for πN scattering to fourth order

2004

We extend our previous analysis of the unitarized pion-nucleon scattering amplitude including up to fourth order terms in heavy baryon chiral perturbation theory. We pay special attention to the stability of the generated Delta(1232) resonance, the convergence problems, and the power counting of the chiral parameters.

Parameterized nonrelativistic limit of stellar structure equations in Ricci-based gravity theories

2021

We present the non-relativistic limit of the stellar structure equations of Ricci-based gravities, a family of metric-affine theories whose Lagrangian is built via contractions of the metric with the Ricci tensor of an a priori independent connection. We find that this limit is characterized by four parameters that arise in the expansion of several geometric quantities in powers of the stress-energy tensor of the matter fields. We discuss the relevance of this result for the phenomenology of non-relativistic stars, such as main-sequence stars as well as several substellar objects.

Junction conditions in Palatinif(R) gravity

2020

We work out the junction conditions for $f(R)$ gravity formulated in metric-affine (Palatini) spaces using a tensor distributional approach. These conditions are needed for building consistent models of gravitating bodies with an interior and exterior regions matched at some hypersurface. Some of these conditions depart from the standard Darmois-Israel ones of General Relativity and from their metric $f(R)$ counterparts. In particular, we find that the trace of the stress-energy momentum tensor in the bulk must be continuous across the matching hypersurface, though its normal derivative need not to. We illustrate the relevance of these conditions by considering the properties of stellar sur…

Rotating black holes in Eddington-inspired Born-Infeld gravity: an exact solution

2020

We find an exact, rotating charged black hole solution within Eddington-inspired Born-Infeld gravity. To this end we employ a recently developed correspondence or {\it mapping} between modified gravity models built as scalars out of contractions of the metric with the Ricci tensor, and formulated in metric-affine spaces (Ricci-Based Gravity theories) and General Relativity. This way, starting from the Kerr-Newman solution, we show that this mapping bring us the axisymmetric solutions of Eddington-inspired Born-Infeld gravity coupled to a certain model of non-linear electrodynamics. We discuss the most relevant physical features of the solutions obtained this way, both in the spherically sym…

Mecanismos de atenuación entre el decir y lo dicho: procesos de enunciación a través de la partícula discursiva digamos

2018

Este trabajo presenta los resultados obtenidos en el análisis de la partícula discursiva digamos en corpus coloquiales (Val.Es.Co. 2002 y 2.0.), aplicando el sistema de unidades, niveles y posiciones Val.Es.Co. (Briz y grupo Val.Es.Co. 2003, 2014) y la ficha Es. Por. Atenuación (Albelda et alii 2014). El resultado integra dos perspectivas de análisis para determinar si factores como la unidad ocupada o posición discursiva condicionan su polifuncionalidad. This study presents the results obtained from the analysis of the Spanish discourse particle digamos in colloquial corpus. The Val.Es.Co. proposal (Briz et alii 2003, 2014) and the Es.Var.Atenuación analysis sheet (Albelda et alii 2014) ar…

Resonances, chiral symmetry, coupled channel unitarity and effective Lagrangians

1999

By means of a coupled channel non-perturbative unitary approach, it is possible to extend the strong constrains of Chiral Perturbation Theory to higher energies. In particular, it is possible to reproduce the lowest lying resonances in meson-meson scattering up to 1.2 GeV using the parameters of the O(p^2) and O(p^4) Chiral Lagrangian. We report on an update of these results examining their possible relevance for meson spectroscopy.

SU(3) Chiral approach to meson and baryon dynamics

1999

We report on recent progress on the chiral unitary approach, which is shown to have a much larger convergence radius than ordinary chiral perturbation theory, allowing one to reproduce data for meson meson interaction up to 1.2 GeV and meson baryon interaction up to the first baryonic resonances. Applications to physical processes so far unsuited for a standard chiral perturbative approach are presented, concretely the K^- p\to\Lambda(1405)\gamma reaction and the N^\ast (1535)N^\ast(1535)\pi and \eta couplings.

A non-perturbative chiral approach for meson-meson interactions

2000

A non-perturbative method which combines constraints from chiral symmetry breaking and coupled channel unitarity is used to describe meson-meson interactions up to \sqrt{s}\lesssim 1.2 GeV, extending in this way the range of applicability of the information contained in Chiral Perturbation Theory (\chi PT), since this perturbative series is typically restricted to \sqrt{s}\lesssim 500 MeV. The approach uses the O(p^2) and O(p^4) \chiPT Lagrangians. The seven free parameters resulting from the O(p^4) Lagrangian are fitted to the experimental data. The approach makes use of the expansion of T^{-1} instead of the amplitude itself as done in \chiPT. The former expansion is suggested by analogy …