Particle collisions near a three-dimensional warped AdS black hole

In this paper we consider the warped AdS$_{3}$ black hole solution of topologically massive gravity with a negative cosmological constant, and we investigate the possibility that it acts as a particle accelerator by analyzing the energy in the center of mass (CM) frame of two colliding particles in the vicinity of its horizon, which is known as the Ba\~nados, Silk and West (BSW) process. Mainly, we show that the critical angular momentum $(L_c)$ of the particle decreases when the parameter that controls the stretching deformation ($\nu$) increases. Also, we show that despite the particle with $L_c$ can exist for certain values of the conserved energy outside the horizon, it will never reach the event horizon; therefore, the black hole can not act as a particle accelerator with arbitrarily high CM energy on the event horizon. However, such particle could also exist inside the outer horizon being the BSW process possible on the inner horizon. On the other hand, for the extremal warped AdS$_{3}$ black hole, the particle with $L_c$ and energy $E$ could exist outside the event horizon and the CM energy blows up on the event horizon if its conserved energy fulfill the condition $E^{2}>\frac{(\nu^{2}+3)l^{2}}{3(\nu^{2}-1)}$, being the BSW process possible.Comment: 11 pages, 6 figure

Fermionic greybody factors of two and five-dimensional dilatonic black holes

We study fermionic perturbations in the background of a two and five-dimensional dilatonic black holes. Then, we compute the reflection and transmission coefficients and the absorption cross section for fermionic fields, and we show numerically that the absorption cross section vanishes in the low and high frequency limit. Also we find that beyond a certain value of the horizon radius $r_0$ the absorption cross section for five-dimensional dilatonic black hole is constant. Besides, we have find that the absorption cross section decreases for higher angular momentum, and it decreases when the mass of the fermionic field increases.Comment: Accepted in EPJ

Structure of Ethical Governance in Commercial Advertising. Review of the Autocontrol Model from a Discursive Stakeholder Management

In competitive and global environments in which companies operate commercial advertising plays a vital role that is essential to have full responsibility. This responsibility involves in many cases, self-regulation of advertising to ensure the guiding principles: truthfulness, legality, honesty and loyalty. In Spain the governance structure of Autocontrol came up with this goal in 1 995, where the political, business and civil society spheres come together to try to coordinate their action to promote advertising self-regulation. The article focuses on a critical study of the governance system developed by Autocontrol, self-regulatory organization of the Commercial Communications, founded in 1 995 in Spain. With nearly twenty years of business experience seems an appropriate time to review its management and governance structure from an ethical point of view. This goal will be accomplished using the discourse ethics and the stakeholder management approach.En los entornos competitivos y globales en los que las empresas desarrollan su actividad la publicidad comercial cumple un papel vital que es fundamental llevar a cabo con plena responsabilidad. Esta responsabilidad pasa, en muchas ocasiones, por una autorregulación de la publicidad para garantizar los principios rectores de: veracidad, legalidad, honestidad y lealtad. En España surgió con este objetivo la estructura de gobernanza de Autocontrol en 1 995, donde el ámbito político, empresarial y de la sociedad civil se dan la mano para tratar de coordinar su acción para promover la autorregulación publicitaria. El artículo se centra en un estudio crítico del sistema de gobernanza desarrollado por Autocontrol, entidad de autorregulación de la Comunicación Comercial, creada en 1 995 en España. Con una experiencia cercana a los veinte años de andadura parece un momento adecuado para revisar su estructura gerencial y de gobernanza desde un punto de vista ético. Este objetivo se llevará a cabo utilizando la ética discursiva y el enfoque gerencial de los stakeholders

Ethic and advertising self-regulation: A perspective from consumer associations

La búsqueda por promocionar unos estándares éticos mínimos de publicidad es una preocupación en los sistemas de autorregulación. En España esta disciplina fue introducida en la práctica en 1995, año de la fundación de Autocontrol. El objetivo de este artículo es examinar el punto de vista de las asociaciones de consumidores con respecto al funcionamiento de esta asociación. Se desea conocer la valoración que las asociaciones realizan específicamente del sistema de reclamaciones de Autocontrol, pieza clave (y única) para la participación de actores “externos” a la asociación. El método empleado es un estudio de caso donde adquieren un peso especial las entrevistas a asociaciones de consumidores.The quest to promote minimum ethical advertising standards is a concern in self-regulatory systems. This practice was introduced in Spain in 1995, the same year Autocontrol was founded. This article aims to examine how consumer associations view the functions of Autocontrol; specifically, the assessment these associations make of the Autocontrol claims system that is a key (and the only) part for any “external” actors to the association to be able to participate. The method used is a case study in which interviews with consumer associations were especially relevant

Autocontrol: A Critical Study of Achievements and Challenges in the Pursuit of Ethical Advertising Through an Advertising Self-Regulation System

The theory and practice of advertising self-regulation have been evolving for decades in pursuit of basic standards for advertising quality. In Spain, this discipline was put into practice in 1995, the year the Association for the Self-Regulation of Commercial Communication (Autocontrol) was created. This article aims to examine in depth the functioning of the Spanish advertising self-regulation system, with special emphasis on the Advertising Jury, and explore to what extent some of the normative requirements of rigour, independence and participation can be considered to have been met. The paper is based on a case study in which interviews with Autocontrol members, Jury members and consumer associations have particular bearing. The results shed light on the achievements of Autocontrol’s self-regulation work and the challenges it still faces.The authors, who are members of the Spanish research project FI2013-47136-C2-2-P, would like to express their gratitude to all the association members and individuals who were interviewed during the study, and for their attention, help and patience during the research project. In addition, the authors would like to acknowledge and thank the anonymous reviewers for their comments, which have greatly improved this paper

Charged scalar field perturbations in Ernst black holes

We consider the propagation of a charged massive scalar field in the background of a four-dimensional Ernst black hole and study its stability analyzing the quasinormal modes (QNMs), which are calculated using the semi-analytical Wentzel-Kramers-Brillouin method and numerically using the continued fraction method. Mainly, we find that for a scalar field mass less than a critical mass, the decay rate of the QNMs decreases when the harmonic angular number $\ell$ increases; and for a scalar field mass greater than the critical mass the behaviour is inverted, i.e, the longest-lived modes are always the ones with the lowest angular number recovering the standard behaviour. Also, we find a critical value of the external magnetic field, as well as, a critical value of the scalar field charge that exhibit the same behaviour with respect to the angular harmonic numbers. In addition, we show that the spacetime allows stable quasibound states and we observe a splitting of the spectrum due to the Zeeman effect. Finally, we show that the unstable null geodesic in the equatorial plane is connected with the QNMs when the azimuthal quantum number satisfy $m= \pm \ell$ in the eikonal limit.Comment: 14 pages and 7 figures. arXiv admin note: text overlap with arXiv:gr-qc/0211035 by other author

Relics and Historical Uses of Human Zootherapeutic Products in Contemporary Spanish Ethnoveterinary Medicine

Background: this review documents the wide repertoire of practices and remedies based on the use of human-derived products in Spanish ethnoveterinary medicine (EVM) from the early 20th century to the present. These practices are compared with historical data and those of other countries; (2) Methods: a search using advanced functions in the most important databases in the fields of ethnobiology, EVM, folklore, and ethnography was performed. Information was obtained from 29 documentary sources; (3) Results: from the search of the literature, 46 use-reports related to the veterinary use of human urine, menstrual fluid, saliva, breast milk, and faeces were recorded. These zootherapeutic resources are/were used to treat 20 animal diseases, in particular dermatological ailments. In addition, many practices of the magical-religious type are documented; (4) Conclusions: the veterinary uses described and analysed here are fundamental to the development of therapeutic tools and creating teaching and learning processes in new popular veterinary practices adapted to the users and those who demand them. The information collected could form a scientific foundation for future inventories of local veterinary knowledge (LVK) and research addressing the discovery of new drugs for livestock. This work contributes to the inventory of some uses, traditional practices, and rituals seriously threatened by the progressive loss of LVK in Europ

Present and future of the OTELO project

OTELO is an emission-line object survey carried out with the red tunable filter of the instrument OSIRIS at the GTC, whose aim is to become the deepest emission-line object survey to date. With 100% of the data of the first pointing finally obtained in June 2014, we present here some aspects of the processing of the data and the very first results of the OTELO survey. We also explain the next steps to be followed in the near future.Comment: Oral contribution presented in the XI Scientific Meeting of the Spanish Astronomical Society held on September 8-12, in Teruel, Spain (7 pages, 2 figures, 1 table). To appear in Highlights of Spanish Astrophysics VIII, Proceedings of the XI Scientific Meeting of the Spanish Astronomical Society. Eds. A. J. Cenarro, F. Figueras, C. Hern\'andez-Monteagudo, J. Trujillo, L. Valdiviels