Type Ia supernovae: differences due to progenitors within delayed detonation explosions

At this moment, the use of SNIa for cosmology lies on the assumption that the SNe at high redshifts are equal to the local ones. However, some observations indicate a correlation between the light curve (LC) properties and the morphological type of the host galaxy. This could indicate a dependence with the age (mass/composition) of the underlying population. In this work we have chosen the delayed detonation explosion model in CO Chandrasekhar mass WDs to explore the dependence of the SNIa LC and nucleosynthesis with the initial mass and composition of the WD progenitor. The progenitor influences the final SNIa via the mass of the CO core formed and the C/O ratio within it (1D explosion models). We have followed the evolution of stars with masses between 1.5 and 8 Mo and metallicity, Z=0, 1.E-05, 0.001 and 0.02, from the pre-main sequence to the TP-AGB phase. The differences obtained in the final C/O ratio within the explosive WD are smaller than 22%. This results in a difference at maximum of 0.03 mag and of 0.1 mag when the brightness-decline relation is applied.Comment: 4 pages, 1 figure, needs espcrc1.sty; conference "Nuclei in the Cosmos 2000", held in Arhus, Denmark, June 27-July 1, 2000; submitted to Nucl. Phys.

Asymptotic Giant Brach Stars as Astroparticle Laboratories

We show that the inclusion of axion emission during stellar evolution introduces important changes into the evolutionary behaviour of AGB stars. The mass of the resulting C/O white dwarf is much lower than the equivalent obtained from standard evolution. This implies a deficit in luminous AGB stars and in massive WDs. Moreover the total mass processed in the nuclear burning shells that is dredged-up to the surface ($3^{rd} D_{up}$) increases when axion emission is included, modifying the chemical composition of the photosphere. We conclude that the AGB is a promising phase to put constraints on particle physicsComment: 8 pages, 3 tables, 8 figures, accepted for publication in MNRA

Axion-electron coupling from the RGB tip of Globular Clusters

We present a preliminary study of the Globular Cluster RGB devoted to improve the available constraint for the axion-electron coupling. By means of multi-band IR photometry of the cluster M3 we obtain g_{ae}/10^{-13} < 2.57 (95\% C.L.).Comment: paper submitted to Proceedings of the 13th Patras Workshop on Axions, WIMPs and WISPs (Patras2017)

Impact of Axions on the Minimum Mass of Core Collapse Supernova Progenitors

In this study we include axions in stellar evolution models adopting the current stringest constraints for their coupling to photons and electrons. We obtain that the minimum stellar mass of Core Collapse Supernova (CCSN) progenitors is shifted up by nearly 2 Mo. This result seems to be in tension with the observationaly derived minimum mass of CCSN progenitors.Comment: Contributed to the 13th Patras Workshop on Axions, WIMPs and WISPs, Thessaloniki, May 15 to 19, 201

Avaluació de dispositius wearables i disseny d'una aplicació per a la comunicació amb un smartphone

The objective of this Treball Final de Grau is studying wearable devices and developing applications for them. This document contains a few concepts about Android applications and basic guidelines to program an application for Android Wear O.S. that could be followed by the reader for programming his own application. First of all, there is an explanation about the reasons for the device choice, thus comparing commercially available devices and performing an overview of the different O.S. used nowadays. The document presents an application that measures the heart rate through an optical sensor embedded in the wearable device. This application sends the data obtained from the sensor to another application developed in a smartphone. Bluetooth is employed for this purpose. With the objective of understanding how the application works, the document explains the methods used in the application. A guideline for application developers is also included so that a user could be able to develop a new application step by step using the Android Wear O.S. Finally we present some battery level tests on the wearable. We study the impact of the developed application on the battery level, thus evaluating the influence of the heart rate sensor and the use of the Bluetooth link between the applications, along with different scenarios for sending heart rate samples

Pattern Definitions and Semantically Annotated Instances

Ontology design patterns are normally instantiated by replicating and adapting the pattern concepts and roles. The relation between pattern definitions and their instantiations is documented in natural language. The use of parametric ontologies or pattern-reuse modifications to OWL-DL has been suggested before, but so far only practical aspects have been analysed, leaving the formal semantics of these extensions as future work. In this work we present formal definitions for ontology pattern and pattern instantiations, together with the semantics of instantiation. We propose the use of semantic annotations to describe and generate OWL pattern instantiations, without the need for explicit ontology replication, and provide tools to support this processprovide tools to support this process