Propagation of high-energy neutrinos in a background of ultralight scalar dark matter

If high-energy neutrinos propagate in a background of ultralight scalar field particles of dark matter ($m_\varphi \sim 10^{-23}$eV), neutrino-dark matter interactions can play a role and affect the neutrino flux. In this work we analyse this effect using transport equations that account for the neutrino regeneration as well as absorption, and we consider the neutrino flux propagation in the extragalactic medium and also through the galactic halo of dark matter. We show the results for the final flux to arrive on Earth for different cases of point and diffuse neutrino fluxes. {We conclude that this type of neutrino interactions with ultralight scalar particles as dark matter can yield very different results in the neutrino flux and in the flavor ratios that can be measured in neutrino detectors such as IceCube.Comment: 11 pages, 11 figures, accepted for publication in Astroparticle Physic

Deriving Iodine-free spectra for high-resolution echelle spectrographs

We describe a new method to derive clean, iodine-free spectra directly from observations acquired using high-resolution echelle spectrographs equipped with iodine cells. The main motivation to obtain iodine-free spectra is to use portions of the spectrum that are superimposed with the dense forest of iodine absorption lines, in order to retrieve lines that can be used to monitor the magnetic activity of the star, helping to validate candidate planets. In short, we provide a straight-forward methodology to clean the spectra by using the forward model used to derive radial velocities, the Line Spread Function information plus the stellar spectrum without iodine to reconstruct and subtract the iodine spectrum from the observations. We show our results using observations of the star $\tau$ Ceti acquired with the PFS, HIRES and UCLES spectrographs, reaching an iodine-free spectrum correction at the $\sim$1% RMS level. We additionally discuss the limitations and further applications of the method.Comment: 15 pages, 7 figures. Accepted for publication in A

Nanofacies de los sedimentos terciarios de las béticas

Diferenciamos en los sedimentos marinos del Oligoceno superior- Mioceno superior de las Béticas ("moronitas")i nco nanofacies: de diatomeas aciculares, biogénica, cocolítico-detrítica, espicularcocolítico- detritica y detritica. Establecemos las relaciones existentes entre ellas discutiendo su origen y formación

Nonlocality-induced front interaction enhancement

We demonstrate that nonlocal coupling strongly influences the dynamics of fronts connecting two equivalent states. In two prototype models we observe a large amplification in the interaction strength between two opposite fronts increasing front velocities several orders of magnitude. By analyzing the spatial dynamics we prove that way beyond quantitative effects, nonlocal terms can also change the overall qualitative picture by inducing oscillations in the front profile. This leads to a mechanism for the formation of localized structures not present for local interactions. Finally, nonlocal coupling can induce a steep broadening of localized structures, eventually annihilating them.Comment: 4 pages, 6 figure

Nanofacies de los sedimentos terciarios de las béticas

Diferenciamos en los sedimentos marinos del Oligoceno superior- Mioceno superior de las Béticas ("moronitas")i nco nanofacies: de diatomeas aciculares, biogénica, cocolítico-detrítica, espicularcocolítico- detritica y detritica. Establecemos las relaciones existentes entre ellas discutiendo su origen y formación

The Biofuels in the energetic integration of the Unasur

El presente trabajo evalúa el lugar de los biocombustibles en la agenda energética de UNASUR durante 2005-2012. Para ello, se examinan las distintas decisiones que se fueron adoptando en el marco del Consejo Energético Sudamericano, así como también, la inserción internacional de aquellos países miembros con mayor producción en biocombustibles en la región. De esta manera, pretendemos ilustrar la complejidad inherente al proceso de integración energética en América del Sur a través de un conjunto de interrogantes: ¿cuál fue el lugar de la energía en el proceso de construcción y consolidación de UNASUR? y ¿cómo Argentina y Brasil, los mayores productores de biocombustibles en la región, se insertaron por fuera de UNASUR? A partir de los mismos se ha articulado esta investigación, que pretende dar cuenta de la complejidad inherente al proceso de integración energética en América del Sur.In the context of energy integration as a regional problem, this article evaluates the Unasur biofuels policy during 2005-2012. This focuses on two dimensions that are analytically separable but are part of the same empirical object. These are: the political process energy integration that converged in Unasur and the behavior of two of its political units, Brazil and Argentina. A set of descriptions were made around the following areas of analysis: 1. A brief overview of the most relevant background in energy integration; 2. The decisions taken at the regional level in energy; and 3. The relations of Argentina and Brazil and the European Union biofuel.Fil: Lorenzo, Cristian A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Cientificas; ArgentinaFil: Comini, Nicolás Matías. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad del Salvador. Facultad de Ciencias Sociales; Argentin

Spanish DAL: A Spanish Dictionary of Affect in Language

The topic of sentiment analysis in text has been extensively studied in the English language for the past 30 years. An early, influential work by Cynthia Whissell, the Dictionary of Affect in Language (DAL), allows rating words along three dimensions: pleasantness, activation and imagery. Given the lack of such tools in Spanish, we decided to replicate Whissell’s work in that language. This report describes the Spanish DAL, a Spanish lexicon formed by more than 2500 words manually rated by humans along the same three dimensions. We evaluated its usefulness on two sentiment analysis tasks, which showed that our lexicon managed to capture relevant information regarding the three affective dimensions.Fil:Gravano, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de ComputaciónFil:Dell’Amerlina Ríos, Matías G. Universidad de Buenos Aires. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Computació

Diffusion on a lattice: transition rates, interactions and memory effects

We analyze diffusion of particles on a two dimensional square lattice. Each lattice site contains an arbitrary number of particles. Interactions affect particles only in the same site, and are macroscopically represented by the excess chemical potential. In a recent work, a general expression for transition rates between neighboring cells as functions of the excess chemical potential was derived. With transition rates, the mean field tracer diffusivity, $D^\text{MF}$, is immediately obtained. The tracer diffusivity, $D = D^\text{MF} f$, contains the correlation factor $f$, representing memory effects. An analysis of the joint probability of having given numbers of particles at different sites when a force is applied to a tagged particle allows an approximate expression for $f$ to be derived. The expression is applied to soft core interaction (different values for the maximum number of particles in a site are considered) and extended hard core

On Nichols algebras over SL(2,Fq) and GL(2,Fq)

We compute necessary conditions on Yetter-Drinfeld modules over the groups SL(2,Fq) and GL(2,Fq) to generate finite dimensional Nichols algebras. This is a first step towards a classification of pointed Hopf algebras with a group of group-likes isomorphic to one of these groups.Comment: Major exposition revision, including referees remarks. To appear in J. Math. Phys. 13 page