4D gravity localized in non Z_2-symmetric thick branes

We present a comparative analysis of localization of 4D gravity on a non Z_2-symmetric scalar thick brane in both a 5-dimensional Riemannian space time and a pure geometric Weyl integrable manifold. This work was mainly motivated by the hypothesis which claims that Weyl geometries mimic quantum behaviour classically. We start by obtaining a classical 4-dimensional Poincare invariant thick brane solution which does not respect Z_2-symmetry along the (non-)compact extra dimension. The scalar energy density of our field configuration represents several series of thick branes with positive and negative energy densities centered at y_0. The only qualitative difference we have encountered when comparing both frames is that the scalar curvature of the Riemannian manifold turns out to be singular for the found solution, whereas its Weylian counterpart presents a regular behaviour. By studying the transverse traceless modes of the fluctuations of the classical backgrounds, we recast their equations into a Schroedinger's equation form with a volcano potential of finite bottom (in both frames). By solving the Schroedinger equation for the massless zero mode m^2=0 we obtain a single bound state which represents a stable 4-dimensional graviton in both frames. We also get a continuum gapless spectrum of KK states with positive m^2>0 that are suppressed at y_0, turning into continuum plane wave modes as "y" approaches spatial infinity. We show that for the considered solution to our setup, the potential is always bounded and cannot adopt the form of a well with infinite walls; thus, we do not get a discrete spectrum of KK states, and we conclude that the claim that Weylian structures mimic, classically, quantum behaviour does not constitute a generic feature of these geometric manifolds.Comment: 13 pages, 4 figures, JHEP forma

Search for dark matter in the Sun with the ANTARES neutrino telescope in the CMSSM and mUED frameworks

ANTARES is the first neutrino telescope in the sea. It consists of a three-dimensional array of 885 photomultipliers to collect the Cherenkov light induced by relativistic muons produced in CC interactions of high energy neutrinos. One of the main scientific goals of the experiment is the search for dark matter. We present here the analysis of data taken during 2007 and 2008 to look for a WIMP signal in the Sun. WIMPs are one of the most popular scenarios to explain the dark matter content of the Universe. They would accumulate in massive objects like the Sun or the Galactic Center and their self-annihilation would produce (directly or indirectly) high energy neutrinos detectable by neutrino telescopes. Contrary to other indirect searches (like with gamma rays or positrons), the search for neutrinos in the Sun is free from other astrophysical contributions, so the interpretation of a potential signal in terms of dark matter is much more robust

Accuracy of the recombination correction factor (ks) in FFF beams for three ion chamber types

Flattening filter free (FFF) beams pose particular considerations for absolute dosimetry. • These beams are capable to deliver high doses per pulse (DPP) which implies special consideration regarding recombination effects in ionization chambers. • We wanted to know which type of ionization chamber (Farmer, Semiflex or Pinpoint) would be more appropriate for commisioning our new FFF beam

Pinch Technique for Schwinger-Dyson equations

In the context of scalar QED we derive the pinch technique self-energies and vertices directly from the Schwinger-Dyson equations. After reviewing the perturbative construction, we discuss in detail the general methodology and the basic field-theoretic ingredients necessary for the completion of this task. The construction requires the simultaneous treatment of the equations governing the scalar self-energy and the fundamental interaction vertices. The resulting non-trivial rearrangement of terms generates dynamically the Schwinger-Dyson equations for the corresponding Green's functions of the background field method. The proof relies on the extensive use of the all-order Ward-identities satisfied by the full vertices of the theory and by the one-particle-irreducible kernels appearing in the usual skeleton expansion. The Ward identities for these latter quantities are derived formally, and several subtleties related to the structure of the multiparticle kernels are addressed. The general strategy for the generalization of the method in a non-Abelian context is briefly outlined, and some of the technical difficulties are discussed.Comment: 43 pages, 11 figures; title and abstract slightly modified, several clarifying discussions added; final version to match the one accpted for publication in JHE

Electrónica de Potencia y Créditos ECTS: Experiencia Piloto y Material Docente Empleado

En esta comunicación se presenta por una parte la adaptación de la asignatura Electrónica de Potencia a créditos ECTS, realizado en la Escuela Politécnica Superior de Jaén dentro de la Experiencia Piloto Andaluza y por otra, un trabajo realizado en el Departamento de Ingeniería Electrónica de la Universidad de Jaén, sobre ésta materia, con el que se pretende potenciar la docencia de la misma; trabajo realizado sobre las diferentes unidades didácticas, en formato electrónico interactivo, incorporando hipertexto, gráficos, enlaces a sitios Web y problemas propuestos con sus correspondientes enlaces a las herramientas de simulación como Mathcad y Pspice

Discovery and Observations of ASASSN-13db, an EX Lupi-Type Accretion Event on a Low-Mass T Tauri Star

We discuss ASASSN-13db, an EX Lupi-type ("EXor") accretion event on the young stellar object (YSO) SDSS J051011.01$-$032826.2 (hereafter SDSSJ0510) discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). Using archival photometric data of SDSSJ0510 we construct a pre-outburst spectral energy distribution (SED) and find that it is consistent with a low-mass class II YSO near the Orion star forming region ($d \sim 420$ pc). We present follow-up photometric and spectroscopic observations of the source after the $\Delta V \sim-$5.4 magnitude outburst that began in September 2013 and ended in early 2014. These data indicate an increase in temperature and luminosity consistent with an accretion rate of $\sim10^{-7}$ $\rm{M}_\odot$ yr$^{-1}$, three or more orders of magnitude greater than in quiescence. Spectroscopic observations show a forest of narrow emission lines dominated by neutral metallic lines from Fe I and some low-ionization lines. The properties of ASASSN-13db are similar to those of the EXor prototype EX Lupi during its strongest observed outburst in late 2008.Comment: 14 pages, 4 figures, 1 table. Updated May 2014 to reflect changes in the final version published in ApJL. Photometric data presented in this submission are included as ancillary files. For a brief video explaining this paper, see http://youtu.be/yRCCrNJnvt

Herramienta de apoyo a la docencia de la energía solar fotovoltaica

Con el siguiente trabajo se pretende colaborar en la formación y difusión de la energía solar fotovoltaica; energía alternativa, para la obtención de electricidad, que ocupa un apartado especial en las acciones clave de la Unión Europea. La Universidad de Jaén cuenta con dos asignaturas optativas, como herramientas para contribuir a estos fines. Estas asignaturas pertenecen al plan de estudios correspondiente a Ingeniero Técnico Industrial. Dichas materias, “Electricidad Fotovoltaica” e “Instalaciones fotovoltaicas” se ofertan a las especialidades de: Mecánica, Electricidad y las Electrónica Industrial. El Curso de Energía SolarFotovoltaica para Internet forma parte de la formación en estas materias contribuyendo a cambiar el método de enseñanza empleado hasta ahora. Permite favorecer el grado de implicación por parte del alumno en el proceso de enseñanza – aprendizaje, además de proporcionar información con la que los alumnos puedan construir su conocimiento

Herramienta software para el cálculo de la radiación solar en superficies con distinta inclinación: ORIENTSOL

Este documento pretende presentar una herramienta software de carácter didáctico que hace más sencillo tanto la enseñanza como el aprendizaje del cálculo de la radiación solar sobre superficies inclinadas. Este concepto forma parte de los contenidos de la asignatura optativa, “Instalaciones fotovoltaicas”. Ésta es ofertada por la Universidad de Jaén en el plan de estudios correspondiente a Ingeniero Técnico Industrial en las especialidades de: Mecánica, Electricidad y Electrónica Industrial

FRW Cosmology From Five Dimensional Vacuum Brans-Dicke Theory

We follow approach of induced matter theory for 5D vacuum BD, introduce induced matter and potential in 4D hypersurfaces, and employ generalized FRW type solution. We confine ourselves to scalar field and scale factors be functions of the time. This makes the induced potential, by its definition, vanishes. When the scale factor of fifth dimension and scalar field are not constants, 5D eqs for any geometry admit a power law relation between scalar field and scale factor of fifth dimension. Hence the procedure exhibits that 5D vacuum FRW like eqs are equivalent, in general, to corresponding 4D vacuum ones with the same spatial scale factor but new scalar field and coupling constant. We show that 5D vacuum FRW like eqs or its equivalent 4D vacuum ones admit accelerated solutions. For constant scalar field, eqs reduce to usual FRW eqs with typical radiation dominated universe. For this situation we obtain dynamics of scale factors for any geometry without any priori assumption. For nonconstant scalar fields and spatially flat geometries, solutions are found to be power law and exponential ones. We also employ weak energy condition for induced matter, that allows negative/positive pressures. All types of solutions fulfill WEC in different ranges. The power law solutions with negative/positive pressures admit both decelerating and accelerating ones. Some solutions accept shrinking extra dimension. By considering nonghost scalar fields and recent observational measurements, solutions are more restricted. We illustrate that accelerating power law solutions, which satisfy WEC and have nonghost fields, are compatible with recent observations in ranges -4/3 < \omega </- -1.3151 and 1.5208 </- n < 1.9583 for dependence of fifth dimension scale factor with usual scale factor. These ranges also fulfill condition nonghost fields in the equivalent 4D vacuum BD eqs.Comment: 18 pages, 16 figures, 11 table

Herramienta docente en la asignatura de instalaciones fotovoltaicas (Design SFA v1.0). Adaptación a los créditos ECTS

Este documento pretende presentar una herramienta software de car&aacute;cter docente orientada al aprendizaje del dise&ntilde;o de&nbsp; Sistemas Fotovoltaicos Aut&oacute;nomos (SFA). Este &uacute;ltimo forma parte de los contenidos de las asignaturas optativas, &ldquo;Instalaciones fotovoltaicas&rdquo; y &ldquo;Electricidad Fotovoltaica&rdquo;, ofertadas por la Universidad de Ja&eacute;n en el plan de estudios correspondiente a Ingeniero T&eacute;cnico Industrial en las especialidades de: Mec&aacute;nica, Electricidad y Electr&oacute;nica Industrial. As&iacute; mismo, el dise&ntilde;o de los SFA tambi&eacute;n conforma un m&oacute;dulo del M&aacute;ster de Energ&iacute;as Renovables impartido en esta misma Universidad