Closed timelike curves and chronology protection in quantum and classical simulators

In principe, General Relativity seems to allow the existence of closed timelike curves (CTC). However, when quantum effects are considered, it is likely that their existence is prevented by some kind of chronological protection mechanism, as Hawking conjectured. Confirming or refuting the conjecture would require a full quantum theory of gravity. Meanwhile, the use of simulations could shed some light on this issue. We propose simulations of CTCs in a quantum system as well as in a classical one. In the quantum simulation, some restrictions appear that are not present in the classical setup, which could be interpreted as an analogue of a chronology protection mechanism.Comment: 6 pages, 4 figures. v2: published versio

Importancia de la información para el paciente con enfermedad inflamatoria intestinal

El término enfermedad inflamatoria intestinal (EII) se emplea de forma general para referirse a enfermedades inflamatorias crónicas del intestino con un curso recurrente en forma de brotes. Generalmente al hablar de EII nos estamos refiriendo a colitis ulcerosa (CU) y enfermedad de Crohn (EC). Ambas patologías tienen una etiología aún no perfectamente conocida, pero se conoce la influencia de factores genéticos y ambientales como el tabaco. No existen evidencias firmes que asocien la EII con hábitos dietéticos o microorganismos, aunque estudios recientes relacionan la EII con características de la microbiota intestinal. Por sus características, la EII conlleva un gran impacto físico, psicológico y social que merma la calidad de vida del paciente. Por ello es vital la relación y comunicación médico-paciente, la cual contribuye a la mejora de los resultados en su salud. Objetivos: conocer el nivel de información subjetivo del paciente y sus preocupaciones; su impacto en la calidad de vida, la evolución y el tratamiento de la EII; y las principales fuentes de información del paciente.Grado en Medicin

Quantitative equidistribution for the solutions of systems of sparse polynomial equations

For a system of Laurent polynomials f_1,..., f_n \in C[x_1^{\pm1},..., x_n^{\pm1}] whose coefficients are not too big with respect to its directional resultants, we show that the solutions in the algebraic n-th dimensional complex torus of the system of equations f_1=\dots=f_n=0, are approximately equidistributed near the unit polycircle. This generalizes to the multivariate case a classical result due to Erdos and Turan on the distribution of the arguments of the roots of a univariate polynomial. We apply this result to bound the number of real roots of a system of Laurent polynomials, and to study the asymptotic distribution of the roots of systems of Laurent polynomials with integer coefficients, and of random systems of Laurent polynomials with complex coefficients.Comment: 29 pages, 2 figures. Revised version, accepted for publication in the American Journal of Mathematic

Comparison of Feature Extraction Methods and Predictors for Income Inference

Abstract—Patterns of mobile phone communications, coupled with the information of the social network graph and financial behavior, allow us to make inferences of users’ socio-economic attributes such as their income level. We present here several methods to extract features from mobile phone usage (calls and messages), and compare different combinations of supervised machine learning techniques and sets of features used as input for the inference of users’ income. Our experimental results show that the Bayesian method based on the communication graph outperforms standard machine learning algorithms using nodebased features.Sociedad Argentina de Informática e Investigación Operativa (SADIO

Route planning algorithms: Planific@ Project

Planific@ is a route planning project for the city of Madrid (Spain). Its main aim is to develop an intelligence system capable of routing people from one place in the city to any other using the public transport. In order to do this, it is necessary to take into account such things as: time, traffic, user preferences, etc. Before beginning to design the project is necessary to make a comprehensive study of the variety of main known route planning algorithms suitable to be used in this projec

Análisis del efecto de las poliaminas 1,3-diaminopropano y espermidina sobre el proteoma intracelular del hongo productor de penicilina Penicillium chrysogenum

Comunicaciones a congreso