Holographic charge localization at brane intersections

Using gauge/gravity duality, we investigate charge localization near an interface in a strongly coupled system. For this purpose we consider a top-down holographic model and determine its conductivities. Our model corresponds to a holographic interface which localizes charge around a (1+1)-dimensional defect in a (2+1)-dimensional system. The setup consists of a D3/D5 intersection at finite temperature and charge density. We work in the probe limit, and consider massive embeddings of a D5-brane where the mass depends on one of the field theory spatial directions, with a profile interpolating between a negative and a positive value. We compute the conductivity in the direction parallel and perpendicular to the interface. For the latter case we are able to express the DC conductivity as a function of background horizon data. At the interface, the DC conductivity in the parallel direction is enhanced up to five times with respect to that in the orthogonal one. We study the implications of broken translation invariance for the AC and DC conductivities.Comment: 36 pages, 12 figures. v2: typos corrected, JHEP versio

Three-family left-right symmetry with low-scale seesaw mechanism

We suggest a new left-right symmetric model implementing a low-scale seesaw mechanism in which quantum consistency requires three families of fermions. The symmetry breaking route to the Standard Model determines the profile of the "next" expected new physics, characterized either by the simplest left-right gauge symmetry or by the 3-3-1 scenario. The resulting $Z^\prime$ gauge bosons can be probed at the LHC and provide a production portal for the right-handed neutrinos. On the other hand, its flavor changing interactions would affect the K, D and B neutral meson systems.Comment: 10 pages, 2 figures. Revised version as accepted by JHE

Dominated splitting and zero volume for incompressible three-flows

We prove that there exists an open and dense subset of the incompressible 3-flows of class C^2 such that, if a flow in this set has a positive volume regular invariant subset with dominated splitting for the linear Poincar\'e flow, then it must be an Anosov flow. With this result we are able to extend the dichotomies of Bochi-Ma\~n\'e and of Newhouse for flows with singularities. That is we obtain for a residual subset of the C^1 incompressible flows on 3-manifolds that: (i) either all Lyapunov exponents are zero or the flow is Anosov, and (ii) either the flow is Anosov or else the elliptic periodic points are dense in the manifold.Comment: 23 pages, no figure

A Model of Comprehensive Unification

Comprehensive - that is, gauge and family - unification using spinors has many attractive features, but it has been challenged to explain chirality. Here, by combining an orbifold construction with more traditional ideas, we address that difficulty. Our candidate model features three chiral families and leads to an acceptable result for quantitative unification of couplings. A potential target for accelerator and astronomical searches emerges.Comment: 5 pages, 2 figures. Published versio

Soil water studies in a hillslope segment of an upland catchment in south east Scotland

SIGLEAvailable from British Library Document Supply Centre- DSC:D72378/87 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Efficient Computation of Multiple Density-Based Clustering Hierarchies

HDBSCAN*, a state-of-the-art density-based hierarchical clustering method, produces a hierarchical organization of clusters in a dataset w.r.t. a parameter mpts. While the performance of HDBSCAN* is robust w.r.t. mpts in the sense that a small change in mpts typically leads to only a small or no change in the clustering structure, choosing a "good" mpts value can be challenging: depending on the data distribution, a high or low value for mpts may be more appropriate, and certain data clusters may reveal themselves at different values of mpts. To explore results for a range of mpts values, however, one has to run HDBSCAN* for each value in the range independently, which is computationally inefficient. In this paper, we propose an efficient approach to compute all HDBSCAN* hierarchies for a range of mpts values by replacing the graph used by HDBSCAN* with a much smaller graph that is guaranteed to contain the required information. An extensive experimental evaluation shows that with our approach one can obtain over one hundred hierarchies for the computational cost equivalent to running HDBSCAN* about 2 times.Comment: A short version of this paper appears at IEEE ICDM 2017. Corrected typos. Revised abstrac

Influencia de la implementación de las políticas públicas en el desarrollo local de la Municipalidad distrital de Paucarpata - Arequipa 2020

El trabajo de investigación que elaborado tiene como principal propósito determinar la influencia de la implementación de políticas públicas en el desarrollo local de la municipalidad distrital de Paucarpata Arequipa 2020.Dicha investigación se realiza dentro de un enfoque empírico deductivo, que corresponde a un tipo de investigación no experimental, desarrollado bajo un diseño correlacional causal, la población es de tipo probabilístico deducida de una fórmula de población infinita y está conformada por todos los pobladores de la municipalidad distrital de Paucarpata. La técnica utilizada fue la encuesta y el instrumento fue el cuestionario; los datos fueron procesados mediante el análisis estadístico de tipo descriptivo lo que se demuestra en tablas, así mismo del análisis de la hipótesis general y especificas se realizó la estadística inferencial siendo la principal herramienta el análisis de regresión lineal, es así que la investigación concluye en que la implementación de las políticas públicas influye en el desarrollo local en un 69.10% mostrando un coeficiente de determinación R2 = 0,696 y un grado de relación de 0.834 lo que demuestra que tiene una relación directa alta

Lectura comprensiva y pensamiento crítico en los alumnos universitarios de la Facultad de Sociología de la Universidad Nacional Mayor de San Marcos – Lima, 2018.

La presente tesis tiene como título Lectura comprensiva y pensamiento crítico en los alumnos universitarios de la Facultad de Sociología de la Universidad Nacional Mayor de San Marcos – Lima, 2018 y tiene como objetivo general determinar la relación entre la lectura comprensiva y el pensamiento crítico. Es una investigación descriptiva correlacional, de diseño no exsperimental con un enfoque cuantitativo. La población la conforman los alumnos universitarios de la Facultad de Sociología de la Universidad Nacional Mayor de San Marcos. Se utilizaron como instrumento para la recolección de datos dos cuestionarios, uno para la variable lectyura comprensiva y otro para la variable pensamiento crítico, los resultados mostraron una correlación alta con un rho = 0.833 y significativa con un p = 0.000Universidad Nacional de Educación Enrique Guzmán y ValleTesi