Entanglement dynamics via semiclassical propagators in systems of two spins

We analyze the dynamical generation of entanglement in systems of two interacting spins initially prepared in a product of spin coherent states. For arbitrary time-independent Hamiltonians, we derive a semiclassical expression for the purity of the reduced density matrix as function of time. The final formula, subsidiary to the linear entropy, shows that the short-time dynamics of entanglement depends exclusively on the stability of trajectories governed by the underlying classical Hamiltonian. Also, this semiclassical measure is shown to reproduce the general properties of its quantum counterpart and give the expected result in the large spin limit. The accuracy of the semiclassical formula is further illustrated in a problem of phase exchange for two particles of spin $j$.Comment: 10 page

Heideggers Kunstwerkaufsatz in mehrstimmiger Perspektive

Review to: David Espinet, Tobias Keiling (Hrsg.), Heideggers Ursprung des Kunstwerks. Ein Kooperativer Kommentar, Frankfurt am Main: Klostermann Verlag, 201

Genetic ancestry of participants in the National Children's Study.

BackgroundThe National Children's Study (NCS) is a prospective epidemiological study in the USA tasked with identifying a nationally representative sample of 100,000 children, and following them from their gestation until they are 21 years of age. The objective of the study is to measure environmental and genetic influences on growth, development, and health. Determination of the ancestry of these NCS participants is important for assessing the diversity of study participants and for examining the effect of ancestry on various health outcomes.ResultsWe estimated the genetic ancestry of a convenience sample of 641 parents enrolled at the 7 original NCS Vanguard sites, by analyzing 30,000 markers on exome arrays, using the 1000 Genomes Project superpopulations as reference populations, and compared this with the measures of self-reported ethnicity and race. For 99% of the individuals, self-reported ethnicity and race agreed with the predicted superpopulation. NCS individuals self-reporting as Asian had genetic ancestry of either South Asian or East Asian groups, while those reporting as either Hispanic White or Hispanic Other had similar genetic ancestry. Of the 33 individuals who self-reported as Multiracial or Non-Hispanic Other, 33% matched the South Asian or East Asian groups, while these groups represented only 4.4% of the other reported categories.ConclusionsOur data suggest that self-reported ethnicity and race have some limitations in accurately capturing Hispanic and South Asian populations. Overall, however, our data indicate that despite the complexity of the US population, individuals know their ancestral origins, and that self-reported ethnicity and race is a reliable indicator of genetic ancestry

Honeypot-powered Malware Reverse Engineering

Honeypots, i.e. networked computer systems specially designed and crafted to mimic the normal operations of other systems while capturing and storing information about the interactions with the world outside, are a crucial technology into the study of cyber threats and attacks that propagate and occur through networks. Among them, high interaction honeypots are considered the most efficient because the attacker (whether automated or not) perceives realistic interactions with the target machine. In the case of automated attacks, propagated by malwares, currently available honeypots alone are not specialized enough to allow the analysis of their behaviors and effects on the target system. The research presented in this paper shows how high interaction honeypots can be enhanced by powering them with specific features that improve the reverse engineering activities needed to effectively analyze captured malicious entities

LA EXPERIENCIA DE LA CORPORALIDAD EN IMÁGENES. PERCEPCIÓN DEL MUNDO, PRODUCCIÓN DE SENTIDOS Y SUBJETIVIDAD

Este artículo parte de la doble dimensión que desde la antropología y la sociología se reconoce al cuerpo como receptor y productor de significados culturales. El interés del mismo es reflexionar sobre el efecto de las imágenes mediáticas en la corporalidad en las sociedades contemporáneas. La doble dimensión se traslada, para el análisis que aquí nos interesa, al cuerpo representado y al cuerpo perceptor de su propia imagen, espejada en otros cuerpos. A los fines de este trabajo, consideraré los modos en que se asienta la relación de los sujetos con la corporalidad a partir de y a través de la imagen: a) el cuerpo como lugar de la experiencia perceptiva del mundo; b) el cuerpo como lugar de producción de sentidos sobre las imágenes de otros cuerpos; y c) el sujeto frente a las imágenes de su propio cuerpo

An Optimal Decision Procedure for MPNL over the Integers

Interval temporal logics provide a natural framework for qualitative and quantitative temporal reason- ing over interval structures, where the truth of formulae is defined over intervals rather than points. In this paper, we study the complexity of the satisfiability problem for Metric Propositional Neigh- borhood Logic (MPNL). MPNL features two modalities to access intervals "to the left" and "to the right" of the current one, respectively, plus an infinite set of length constraints. MPNL, interpreted over the naturals, has been recently shown to be decidable by a doubly exponential procedure. We improve such a result by proving that MPNL is actually EXPSPACE-complete (even when length constraints are encoded in binary), when interpreted over finite structures, the naturals, and the in- tegers, by developing an EXPSPACE decision procedure for MPNL over the integers, which can be easily tailored to finite linear orders and the naturals (EXPSPACE-hardness was already known).Comment: In Proceedings GandALF 2011, arXiv:1106.081

Human Trafficking and Domestic Violence: Etiology, Intervention, and Overlap with Child Maltreatment

Robert Sanborn and Angelo P. Giardino\u27s introduction to The Allstate Foundation-sponsored Volume 6, Issue 1: Human Trafficking and Domestic Violence: Etiology, Intervention, and Overlap with Child Maltreatment