Pion scattering poles and chiral symmetry restoration

Using unitarized Chiral Perturbation Theory methods, we perform a detailed analysis of the $\pi\pi$ scattering poles $f_0(600)$ and $\rho(770)$ behaviour when medium effects such as temperature or density drive the system towards Chiral Symmetry Restoration. In the analysis of real poles below threshold, we show that it is crucial to extend properly the unitarized amplitudes so that they match the perturbative Adler zeros. Our results do not show threshold enhancement effects at finite temperature in the $f_0(600)$ channel, which remains as a pole of broad nature. We also implement T=0 finite density effects related to chiral symmetry restoration, by varying the pole position with the pion decay constant. Although this approach takes into account only a limited class of contributions, we reproduce the expected finite density restoration behaviour, which drives the poles towards the real axis, producing threshold enhancement and $\pi\pi$ bound states. We compare our results with several model approaches and discuss the experimental consequences, both in Relativistic Heavy Ion Collisions and in $\pi\to \pi\pi$ and $\gamma\to \pi\pi$ reactions in nuclei.Comment: 17 pages, 9 figures, final version to appear in Phys.Rev.D, added comments and reference

Disentangling a dynamical Higgs

The pattern of deviations from Standard Model predictions and couplings is different for theories of new physics based on a non-linear realization of the $SU(2)_L\times U(1)_Y$ gauge symmetry breaking and those assuming a linear realization. We clarify this issue in a model-independent way via its effective Lagrangian formulation in the presence of a light Higgs particle, up to first order in the expansions: dimension-six operators for the linear expansion and four derivatives for the non-linear one. Complete sets of pure gauge and gauge-Higgs operators are considered, implementing the renormalization procedure and deriving the Feynman rules for the non-linear expansion. We establish the theoretical relation and the differences in physics impact between the two expansions. Promising discriminating signals include the decorrelation in the non-linear case of signals correlated in the linear one: some pure gauge versus gauge-Higgs couplings and also between couplings with the same number of Higgs legs. Furthermore, anomalous signals expected at first order in the non-linear realization may appear only at higher orders of the linear one, and vice versa. We analyze in detail the impact of both type of discriminating signals on LHC physics.Comment: Version published in JHE

Sacubitril-valsartan in heart failure and multimorbidity patients

Aims The poor control of symptoms in patients with advanced heart failure with reduced ejection function (HFrEF) can limit the functionality of patients. Sacubitril–valsartan, compared with enalapril, has been shown to reduce mortality and hospitalization, and nowadays, there is still little evidence about the improvement on functionality. The aim of our study is to analyse the improvement of the functional class and the 6 min walking test (6MWT) in patients with multiple pathologies and advanced heart failure. Methods and results From September 2016 to March 2018, 65 multimorbidity patients with severe symptomatic HFrEF were initiated to receive sacubitril–valsartan. Mean age was 78.6 ± 7.4 years, and 68% were male. The Charlson co-morbidity index was 8 points. Seventy-four per cent had New York Heart Association (NYHA) Functional Class IV. After the treatment, patients were able to achieve 55.68 m or more on 6MWT, and 91% presented an improvement in the NYHA functional class. Conclusions Sacubitril–valsartan relieves symptoms and improves functional class prognostic risk of patients with advanced HFrEF and co-morbidit

Nuclear structure of Ac-231

The low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus

Aprendiendo de la naturaleza. Estrategia biodigital para una arquitectura sostenible

Throughout history, man has turned to biology to solve his design problems. Today, we face a new stage in design that demands that we take care of nature and its non-renewable resources. From this standpoint, this work conducts an interdisciplinary investigation aimed to identify and classify the concepts that define environmentally friendly architectural projects. It studies paradigmatic cases that position biology and digital systems as a reference barycenter, and that analyzes their application in the field of design. Based on several examples, we attempt to verify results that demonstrate that we stand before a spirit of overcoming, a bio-learning that contributes to the benefit and development of a more human environment. A new design model to conceive architecture in its relationship with nature.A lo largo de la historia, el hombre ha recurrido a la biología para resolver sus problemas proyectuales. Actualmente, nos encontramos ante una nueva etapa del diseño que exige que nos hagamos cargo de la naturaleza y de sus recursos no renovables. A partir de esta perspectiva, este trabajo elabora una investigación interdisciplinaria que tiene como objetivo identificar y clasificar aquellos conceptos que definen a los proyectos arquitectónicos respetuosos del medioambiente. Se trata de un estudio de casos paradigmáticos que posicionan a la biología y a los sistemas digitales como baricentro de referencia y que analiza su aplicación en el campo del diseño. Con una serie de ejemplos, se intentará verificar resultados que nos demuestren que estamos en presencia de una actitud superadora, un bio-learning que contribuya al beneficio y desarrollo de un entorno más humano. Un nuevo modelo proyectual para pensar la arquitectura y su relación con la naturalez

Muon spin rotation and neutron scattering study of the non-centrosymmetric tetragonal compound CeAuAl3

We have investigated the non-centrosymmetric tetragonal heavy-fermion compound CeAuAl3 using muon spin rotation (muSR), neutron diffraction (ND) and inelastic neutron scattering (INS) measurements. We have also revisited the magnetic, transport and thermal properties. The magnetic susceptibility reveals an antiferromagnetic transition at 1.1 K with a possibility of another magnetic transition near 0.18 K. The heat capacity shows a sharp lambda-type anomaly at 1.1 K in zero-filed, which broadens and moves to higher temperature in applied magnetic field. Our zero-field muSR and ND measurements confirm the existence of a long-range magnetic ground state below 1.2 K. Further the ND study reveals an incommensurate magnetic ordering with a magnetic propagation vector k = (0, 0, 0.52) and a spiral structure of Ce moments coupled ferromagnetically within the ab-plane. Our INS study reveals the presence of two well-defined crystal electric field (CEF) excitations at 5.1 meV and 24.6 meV in the paramagnetic phase of CeAuAl3 which can be explained on the basis of the CEF theory. Furthermore, low energy quasi-elastic excitations show a Gaussian line shape below 30 K compared to a Lorentzian line shape above 30 K, indicating a slowdown of spin fluctuation below 30 K. We have estimated a Kondo temperature of TK=3.5 K from the quasi-elastic linewidth, which is in good agreement with that estimated from the heat capacity. This study also indicates the absence of any CEF-phonon coupling unlike that observed in isostructural CeCuAl3. The CEF parameters, energy level scheme and their wave functions obtained from the analysis of INS data explain satisfactorily the single crystal susceptibility in the presence of two-ion anisotropic exchange interaction in CeAuAl3.Comment: 28 pages and 17 figure

El diseño biodigital en el proceso proyectual: metodología alternativa para la enseñanza del diseño

A lo largo de la historia, el hombre ha recurrido a la biología como una fuente de inspiración para resolver sus problemas proyectuales. Desde Leonardo da Vinci durante el Renacimiento, pasando por Antoni Gaudí en los siglos XIX-XX, y más recientemente con los trabajos de Neri Oxman, han convertido a la naturaleza en una maestra invalorable para estudiar los modos de un diseño eficiente, pero también armónico con el contexto. Un rico mundo natural que proporciona un sinnúmero de modelos de los que aprender. Para la escritora Janine Benyus, la naturaleza posee una experiencia de 3.800 millones de años de investigación y desarrollo, sus fracasos han quedado fosilizados, y por tanto, lo que nos rodea son sus supervivientes. Desde esta mirada, y con un enfoque centrado en los procesos desarrollados en la naturaleza, este artículo tiene como objetivo presentar las características del pensamiento biodigital, a modo de una eficaz e innovadora herramienta proyectual. Para ello se propone un estudio de casos, en donde, a partir de la observación de los organismos biológicos y de la utilización de sistemas digitales de modelado y optimización del proyecto, se ha desarrollado una nueva concepción del diseño, un acercamiento a la producción de estructuras complejas de carácter biodigital, bajo un espíritu superador de la propuesta tradicional mecanicista. En esencia, se trata de una arquitectura avanzada, de prospección, de superación de un simple ecologismo convencional, o del uso de los ordenadores como meros sustitutos del dibujo manual: se trata de “un nuevo proyectar ecológico-medioambiental y un nuevo proyectar cibernético-digital”.Throughout history, man has turned to biology as a source of inspiration to solve his design problems. From Leonardo da Vinci during the Renaissance to Antoni Gaudí in the 19th and 20th century, and more recently with the work of Neri Oxman, nature has become an invaluable teacher for studying ways of designing efficiently but also in harmony with the context. A rich natural world that provides countless models to learn from. For the writer Janine Benyus, nature has an experience of 3.8 billion years of research and development, its failures have been fossilised, what surrounds us are its survivors. From this point of view, and with an approach centred on the processes developed in nature, this paper aims to present the characteristics of biodigital thought, as an effective and innovative design tool. To this end, a case study is proposed here, in which, based on the observation of biological organisms and the use of digital systems for modelling and optimising the project, a new conception of design has been developed, an approach to the production of complex structures of a biodigital nature, in a spirit that goes beyond the traditional mechanistic proposal. In essence, it is a question of advanced architecture, of prospection, of overcoming a simple conventional ecologism, or the use of computers as mere substitutes for manual drawing: it is "a new ecological-environmental design and a new cybernetic-digital design"

Local Stories, Global Music. Sound trade marks in the lastest genres of Spanish Cinema

This article deals with the use of music in certain specific cinematic genres in the Spanish context. It focuses specifically on two typologies which are very characteristic of the last decade. First, it is possible to trace the existence of a number of comedies which offer second readings of the musical clichés of the adventure genre in order to use them as elements of parody. As a paradigm of this genre, the composer Roque Baños writes in Hollywood symphonic style for the least "cool" productions of Spanish cinema. In contrast, but complementing this, the theme song constitutes a musical trade mark for the latest expressions of the realist genre. These examples show that to the sound trade marks for each genre, standardized musical conventions, we need to add the peculiarities of each country. This gives rise to meanings that arise from the sum of genre clichés and local characteristics