Estado mexicano publica "Cómo cruzar la frontera". Fox News

Los Ángeles- Críticos de la inmigración ilegal declaran que las fronteras de Estados Unidos siempre han sido fácil de cruzar, y ahora un estado mexicano trata de hacerlo más fácil que nunca. El estado de Yucatán ha publicado un nuevo manual de 87 páginas que instruye a la gente como cruzar la frontera de Estado Unidos ilegalmente. La guía, que viene acompañada de un DVD, contiene una sección de cómo solicitar una visa cumpliendo todos los requisitos, pero las restantes 50 páginas están llenas de instrucciones acerca de cómo introducirse con salvedad a los Estados Unidos y después mezclarse entre la población. "Necesitan cesar y desistir, de hecho, volver a una posición de aliado de los Estados Unidos en lugar de un adversario" dijo J.D. Hayworth, representante de Arizona

Limitado por lo políticamente correcto.

He comenzado a sentirme limitado por tanta correctividad política que se nos ha impuesto tanto por el ala derecha como la izquierda. Ambas partes constantemente intentan infringir nuestra libertad diciéndonos que podemos o no podemos, decir o hacer. Me estoy hartando de esto. A continuación algunos ejemplos acerca de lo que están tratando de imponernos

Bayesian reweighting of nuclear PDFs and constraints from proton-lead collisions at the LHC

New hard-scattering measurements from the LHC proton-lead run have the potential to provide important constraints on the nuclear parton distributions and thus contributing to a better understanding of the initial state in heavy ion collisions. In order to quantify these constraints, as well as to assess the compatibility with available nuclear data from fixed target experiments and from RHIC, the traditional strategy is to perform a global fit of nuclear PDFs. This procedure is however time consuming and technically challenging, and moreover can only be performed by the PDF fitters themselves. In the case of proton PDFs, an alternative approach has been suggested that uses Bayesian inference to propagate the effects of new data into the PDFs without the need of refitting. In this work, we apply this reweighting procedure to study the impact on nuclear PDFs of low-mass Drell-Yan and single-inclusive hadroproduction pseudo-data from proton-lead collisions at the LHC as representative examples. In the hadroproduction case, in addition we assess the possibility of discriminating between the DGLAP and CGC production frameworks. We find that the LHC proton-lead data could lead to a substantial reduction of the uncertainties on nuclear PDFs, in particular for the small-x gluon PDF where uncertainties could decrease by up to a factor two. The Monte Carlo replicas of EPS09 used in the analysis are released as a public code for general use. It can be directly used, in particular, by the experimental collaborations to check, in a straightforward manner, the degree of compatibility of the new data with the global nPDF analyses.Comment: 21 pages, 10 figure

Reduction of polysymplectic manifolds

The aim of this paper is to generalize the classical Marsden-Weinstein reduction procedure for symplectic manifolds to polysymplectic manifolds in order to obtain quotient manifolds which in- herit the polysymplectic structure. This generalization allows us to reduce polysymplectic Hamiltonian systems with symmetries, such as those appearing in certain kinds of classical field theories. As an application of this technique, an analogous to the Kirillov-Kostant-Souriau theorem for polysymplectic manifolds is obtained and some other mathematical examples are also analyzed. Our procedure corrects some mistakes and inaccuracies in previous papers [29, 50] on this subject.Comment: Latex file. 33 pages. New examples, comments and references are adde

Dynamic transition to spontaneous scalarization in boson stars

We show that the phenomenon of spontaneous scalarization predicted in neutron stars within the framework of scalar-tensor tensor theories of gravity, also takes place in boson stars without including a self-interaction term for the boson field (other than the mass term), contrary to what was claimed before. The analysis is performed in the physical (Jordan) frame and is based on a 3+1 decomposition of spacetime assuming spherical symmetry.Comment: Minor changes to match the final version to appear in PR

An Ecosystem Called University

This book is dedicated to the university as a protagonist of change. Its purpose is to see the university as a place where the lines between organization and system are fluid, where the whole is more than the sum of its parts, and the product is knowledge as an end, a means and a way of developing the individual (critical sense) and its interaction with the environment (instrumental reason). The book seeks throughout to foster the image of the Ecosystem University as being a producer of novelty, where the only certainty is uncertainty. The university undergoes a process of permanent spiral growth - the spiral of knowledge without any control of causality - and creating, through its environment, responsible citizens, and free-thinking persons. The Ecosystem University is undeTTast that is assumed in the present. Our work to rediscover the natural feel of an ecosystem embedded in the university and the rich experience of community will take us by the hand and lead us, proud professors, to the purest origin of human knowledge with a flair of joie de vivre: the refreshing purity of the new and the authentic value of ingenuity that will allow us to be ourselves in that very moment: a community that self-organizes, builds projects of life and culture, and determines its own destiny