Heuristic Classification of Physical Theories based on Quantum Correlations

Taking quantum formalism as a point of reference and connection, we explore the various possibilities that arise in the construction of physical theories. Analyzing the distinct physical phenomena that each of them may describe, we introduce the different types of hidden variables theories that correspond to these physical phenomena. A hierarchical classification of the offered theories, based on the degree of correlation between dichotomic observables in bipartite systems, as quantified by a Bell type inequality, is finally proposed.Comment: 13 pages, 2 figure

Un modelo pragmático de la comunicación escrita en el aula de ciencias

En este artículo presentamos un modelo pragmático aproximado de la comunicación escrita en el aula de ciencias. Nos hemos basado eminentemente en las ideas de Umberto Eco sobre la interpretación de textos. Hemos denominado a este modelo aproximación interpretativa (ApIn). El modelo ApIn nos lleva a una nueva visión de la realidad de aula, que trae consigo una reinterpretación de muchos aspectos didácticos y, muy en especial, de la evaluación del aprendizaje. A su vez, el enfoque pragmático permite estudiar de una manera original el problema de la relación entre lenguaje científico y lenguaje ordinario en la enseñanza de las ciencias.In this paper, we present an approximated pragmatic model of written communication in the science classroom. It is mainly based on Umberto Eco's ideas on text interpretation. We have called this model Interpretative Approximation (ApIn, for the Spanish, aproximación interpretativa). The ApIn model brings about a re-interpretation of many didactic features and, in particular, of didactic assessment. Besides, this pragmatic approach allows a fresh view on the problem of the relationship between scientific and ordinary language in the framework of science teaching

BAYESIAN ANALYSIS OF THE COMPOUND COLLECTIVE MODEL: THE NET PREMIUM PRINCIPLE WITH EXPONENTIAL POISSON AND GAMMA–GAMMA DISTRIBUTIONS

This article develops a Bayesian analysis of the Compound Collective Model utilizing the Net Premium Principle, considering single-period models. With respect to likelihoods, we used a Poisson distribution for the number of claims and an Exponential distribution for the severity of the accident/event. Gamma distributions were used for the prior distributions. The robustness of the posterior premium was analyzed with respect to the prior distribution specification of the severity of the accident/event, utilizing contamination classes, these being the class of all the distributions and that of all the unimodal distributions with the same mode. Numerical applications of the results obtained were performed.Compound collective model; Bayesian analysis; Robustness analysis.

Evidence of ongoing radial migration in NGC 6754: Azimuthal variations of the gas properties

Understanding the nature of spiral structure in disk galaxies is one of the main, and still unsolved questions in galactic astronomy. However, theoretical works are proposing new testable predictions whose detection is becoming feasible with recent development in instrumentation. In particular, streaming motions along spiral arms are expected to induce azimuthal variations in the chemical composition of a galaxy at a given galactic radius. In this letter we analyse the gas content in NGC 6754 with VLT/MUSE data to characterise its 2D chemical composition and H$\alpha$ line-of-sight velocity distribution. We find that the trailing (leading) edge of the NGC 6754 spiral arms show signatures of tangentially-slower, radially-outward (tangentially-faster, radially-inward) streaming motions of metal-rich (poor) gas over a large range of radii. These results show direct evidence of gas radial migration for the first time. We compare our results with the gas behaviour in a $N$-body disk simulation showing spiral morphological features rotating with a similar speed as the gas at every radius, in good agreement with the observed trend. This indicates that the spiral arm features in NGC 6754 may be transient and rotate similarly as the gas does at a large range of radii.Comment: 8 pages, 4 figures, accepted for publication in ApJL 2016 September 2