69 research outputs found
Tracking the validity of the quasi-static and sub-horizon approximations in modified gravity
Within the framework of modified gravity (MG), the quasi-static (QS) and
sub-horizon (SH) approximations are widely used in analyses aiming to identify
departures from the concordance model at late-times. In general, it is assumed
that time derivatives are subdominant with respect to spatial derivatives given
that the relevant physical modes are those well inside the Hubble radius. In
practice, the perturbation equations under these approximations are reduced to
a tractable algebraic system in terms of the gravitational potentials and the
perturbations of involved matter fields. Here, in the framework of
theories, we revisit standard results when these approximations are invoked
using a new parameterization scheme that allows us to track the relevance of
each time-derivative term in the perturbation equations. This new approach
unveils terms which are neglected in the standard procedure. We assess the
relevance of these differences by comparing results from both approaches
against full numerical solutions for two well-known toy-models: the designer
model and the Hu-Sawicki model. We find that: i) the SH approximation
can be safely applied to linear perturbation equations for scales Mpc
Mpc, ii) in this "safety region", the QS
approximation provides a very accurate description of the late-time
cosmological dynamics even when dark energy significantly contribute to the
cosmic budget, and iii) our new methodology performs better than the standard
procedure, even for several orders of magnitude in some cases. Although, the
impact of this major improvement on the linear observables is minimal for the
studied cases, this does not represent an invalidation for our approach.
Instead, our findings indicate that the perturbation expressions derived under
these approximations in more general MG theories, such as Horndeski, should be
also revisited.Comment: 28 pages, 18 figures. Changes match published versio
Using machine learning to compress the matter transfer function
The linear matter power spectrum connects theory with large scale
structure observations in cosmology. Its scale dependence is entirely encoded
in the matter transfer function , which can be computed numerically by
Boltzmann solvers, and can also be computed semi-analytically by using fitting
functions such as the well-known Bardeen-Bond-Kaiser-Szalay (BBKS) and
Eisenstein-Hu (EH) formulae. However, both the BBKS and EH formulae have some
significant drawbacks. On the one hand, although BBKS is a simple expression,
it is only accurate up to , which is well above the precision goal
of forthcoming surveys. On the other hand, while EH is as accurate as required
by upcoming experiments, it is a rather long and complicated expression. Here,
we use the Genetic Algorithms (GAs), a particular machine learning technique,
to derive simple and accurate fitting formulae for the transfer function
. When the effects of massive neutrinos are also considered, our
expression slightly improves over the EH formula, while being notably shorter
in comparison.Comment: 12 pages, 7 figures, 2 tables. Changes match published versio
Reconstructing the parameter space of non-analytical cosmological fixed points
Dynamical system theory is a widely used technique in the analysis of
cosmological models. Within this framework, the equations describing the
dynamics of a model are recast in terms of dimensionless variables, which
evolve according to a set of autonomous first-order differential equations. The
fixed points of this autonomous set encode the asymptotic evolution of the
model. Usually, these points can be written as analytical expressions for the
variables in terms of the parameters of the model, which allows a complete
characterization of the corresponding parameter space. However, a thoroughly
analytical treatment is impossible in some cases. In this work, we give an
example of a dark energy model, a scalar field coupled to a vector field in an
anisotropic background, where not all the fixed points can be analytically
found. Then, we put forward a general scheme that provides a numerical
description of the parameter space. This allows us to find interesting
accelerated attractors of the system with no analytical representation. This
work may serve as a template for the numerical analysis of highly complicated
dynamical systems.Comment: 13 pages, 13 figures, 1 table. Changes match the published versio
El cáncer de mama y su relación con los factores de riesgo modificables en mujeres de Armenia- Quindío
El cáncer de mama es el cáncer ginecológico más frecuente en mujeres en todo el mundo, con 1,67 millones de nuevos casos reportados. Existen factores de riesgo modificables, como la nuliparidad o la primiparidad luego de los treinta años, no haber lactado, utilizar terapia de reemplazo hormonal, consumo regular de bebidas alcohólicas, obesidad, inactividad física y consumo de tabaco.Objetivo: describir los factores de riesgo modificables en mujeres de Armenia y su relación con cáncer de mama.Metodología: estudio exploratorio con mujeres de una institución prestadora de salud (IPS) privada de Armenia, con cáncer de mama y que consultaron en el segundo semestre de 2013 previo consentimiento informado; se aplicó el instrumento Step V 2.1 previamente validado. Se realizó una prueba piloto, se utilizó la base de datos SPSS 19 y se hizo un análisis univariado y bivariado
The occurrence of the red-handed howler monkey (Alouatta belzebul) in Amazonian savannas is related to forest patch area and density of flooded area palms
All Neotropical primates are arboreal and thus depend on forests for their survival. Arboreality puts many Neotropical primates at risk of extinction due to the high rates of deforestation in the tropics. We assessed the influence of vegetation structure and forest patch attributes on the occurrence of the threatened red‐handed howler monkey (Alouatta belzebul) in an Amazonian savanna. Using a sample of 38 forest patches in a region of approximately 2000 km2 in the state of Amapá, northern Brazil, we used logistic regression to find the best predictors of the occurrence of A. belzebul. We assessed patch area, patch isolation, the proportion of seasonally flooded forest in the patch, the density of flooded area palms, forest height, canopy cover, and diameter at breast height of trees. Patch area and palm density were the best predictors of the occurrence of A. belzebul in forest patches, both having a positive effect on the probability of occurrence. Our results indicate that areas of flooded forest in forest patches may be keystone habitats for A. belzebul living in Amazonian savannas. The observed effect of palm density on A. belzebul suggests that this variable is useful for planning conservation actions, including the selection of areas for protection and management strategies for areas inhabited by this primate
Laboratorio virtual para la enseñanza de instrumentación electrónica
Los laboratorios virtuales se han consolidado en la última década como una valiosa herramienta de apoyo para el ejercicio docente en diferentes áreas de la formación profesional. En la actualidad podemos encontrar implementaciones que van desde la virtualización de prácticas en ciencias básicas hasta la experimentación virtual en temas específicos de ingeniería. Si bien los mayores desarrollos en este campo se han alcanzado en otras latitudes, en los últimos años, local y regionalmente, se han dado pasos firmes hacia la incorporación efectiva de estos escenarios de enseñanza-aprendizaje a la actividad académica universitaria. Se plantea la implementación de prácticas virtuales para la asignatura de Instrumentación Electrónica como elemento de optimización de los recursos tecnológicos y locativos existentes. Adicionalmente, dentro del marco metodológico del proyecto, se plantean estos escenarios como un medio para fortalecer las experiencias académicas e investigativas del estudiante por fuera del aula de clase. Concluimos que más allá de una mera implementación o novedad tecnológica, los laboratorios virtuales nos abren una puerta para la experimentación con nuevas formas y medios de enseñanza aprendizaje, contribuyendo así a la efectividad formativa de la relación docente-estudiante
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