Simulation of the hydrogen ground state in Stochastic Electrodynamics

Stochastic electrodynamics is a classical theory which assumes that the physical vacuum consists of classical stochastic fields with average energy $\frac{1}{2}\hbar \omega$ in each mode, i.e., the zero-point Planck spectrum. While this classical theory explains many quantum phenomena related to harmonic oscillator problems, hard results on nonlinear systems are still lacking. In this work the hydrogen ground state is studied by numerically solving the Abraham -- Lorentz equation in the dipole approximation. First the stochastic Gaussian field is represented by a sum over Gaussian frequency components, next the dynamics is solved numerically using OpenCL. The approach improves on work by Cole and Zou 2003 by treating the full $3d$ problem and reaching longer simulation times. The results are compared with a conjecture for the ground state phase space density. Though short time results suggest a trend towards confirmation, in all attempted modelings the atom ionises at longer times.Comment: 20 pages, 9 figures. Published version, minor change

El afuera y el adentro de la soledad. La voz femenina en algunos dramas de Calderón de la Barca

Muchos son los trabajos que, desde diversos puntos de vista, estudian la obra dramática de Calderón como un universo esencialmente masculino, en el que los valores impuestos por el hombre determinan no solamente los patrones de conducta que deben normar su propia vida, sino también la de la mujer. Y si bien pueden ser numerosos los estudios dedicados a la figura femenina en el teatro del Siglo de Oro, tal vez no sean tantos los que en él analicen a la mujer como parte de las determinaciones masculinas, cuyo destino y acciones dependen de la voluntad de los hombres

La importancia de la determinación del sexo y la estimación de la edad en paleopatología: sobre un caso con lesiones sugerentes de etiología metastásica

X Congreso Nacional de Paleopatología. Univesidad Autónoma de Madrid, septiembre de 200

Estudio de los marcadores de actividad de los restos recuperados de la Mezquita del Cristo de la Luz (Toledo)

X Congreso Nacional de Paleopatología. Univesidad Autónoma de Madrid, septiembre de 200

Relative Importance of Biotic and Abiotic Soil Components to Plant Growth and Insect Herbivore Population Dynamics

Background: Plants are affected by several aspects of the soil, which have the potential to exert cascading effects on the performance of herbivorous insects. The effects of biotic and abiotic soil characteristics have however mostly been investigated in isolation, leaving their relative importance largely unexplored. Such is the case for the dune grass Ammophila, whose decline under decreasing sand accretion is argued to be caused by either biotic or abiotic soil properties. Methodology/Principal Findings: By manipulating dune soils from three different regions, we decoupled the contributions of region, the abiotic and biotic soil component to the variation in characteristics of Ammophila arenaria seedlings and Schizaphis rufula aphid populations. Root mass fraction and total dry biomass of plants were affected by soil biota, although the latter effect was not consistent across regions. None of the measured plant properties were significantly affected by the abiotic soil component. Aphid population characteristics all differed between regions, irrespective of whether soil biota were present or absent. Hence these effects were due to differences in abiotic soil properties between regions. Although several chemical properties of the soil mixtures were measured, none of these were consistent with results for plant or aphid traits. Conclusions/Significance: Plants were affected more strongly by soil biota than by abiotic soil properties, whereas the opposite was true for aphids. Our results thus demonstrate that the relative importance of the abiotic and biotic component of soils can differ for plants and their herbivores. The fact that not all effects of soil properties could be detected across regions moreover emphasizes the need for spatial replication in order to make sound conclusions about the generality of aboveground-belowground interactions