Overview of business archives in Spain

The ICA Section of Business and Labour Archives is compiling several reports on the position of business archives around the world. The present communication is a state of the art in business archives in Spain, placed in several point: national and regional legislation, specific national policies for business archives, business archives associations, training and current bibliography. A serious problem fort the future of business archives in Spain is the disinterest on the part of the businessmen about the Archive’s importance in a compan

Aspects of Holographic Entanglement at Finite Temperature and Chemical Potential

We investigate the behavior of entanglement entropy at finite temperature and chemical potential for strongly coupled large-N gauge theories in $d$-dimensions ($d\ge 3$) that are dual to Anti-de Sitter-Reissner-Nordstrom geometries in $(d+1)-$dimensions, in the context of gauge-gravity duality. We develop systematic expansions based on the Ryu-Takayanagi prescription that enable us to derive analytic expressions for entanglement entropy and mutual information in different regimes of interest. Consequently, we identify the specific regions of the bulk geometry that contribute most significantly to the entanglement entropy of the boundary theory at different limits. We define a scale, dubbed as the effective temperature, which determines the behavior of entanglement in different regimes. At high effective temperature, entanglement entropy is dominated by the thermodynamic entropy, however, mutual information subtracts out this contribution and measures the actual quantum entanglement. Finally, we study the entanglement/disentanglement transition of mutual information in the presence of chemical potential which shows that the quantum entanglement between two sub-regions decreases with the increase of chemical potential.Comment: 38 pages, multiple figure

Falling Kidnapping Rates and the Expansion of Mobile Phones in Colombia

This paper tries to explain why kidnapping has fallen so dramatically in Colombia during the period 2000-2008. The widely held belief is that the falling kidnapping rates can basically be explained as a consequence of the success of President Alvaro Uribe´s democratic security policy. Without providing conclusive alternative explanations, some academic papers have expressed doubts about Uribe´s security policy being the main cause of this phenomenon. While we consider the democratic security policy as constituting a necessary condition behind Colombia´s falling kidnapping rates, we argue in this paper that a complementary condition underlying this phenomenon has been the significant increase during this period in the speed and quality of communications between potential victims and public security forces. In this sense, the expansion of the mobile phone industry in Colombia implies that there has been a substantial reduction in information asymmetries between kidnappers and targeted citizens. This has led to a higher level of deterrence as well as to higher costs for perpetrating this type of crime. This has resulted in a virtuous circle: improved security allows higher investments in telecommunications around the country, which in turn lead to faster communications between citizens and security forces, which consequently leads to greater security. We introduce a Becker-Ehrlich type supply and demand model for kidnappings. Using regional and departmental data on kidnapping, the police and mobile phones, we show that mobile phone network expansion has expanded the effective coverage of public protection; this, in turn, has led to a spectacular reduction in kidnapping rates.Kidnapping, mobile phones, Colombia

Strongly-coupled anisotropic gauge theories and holography

We initiate a non-perturbative study of anisotropic, non-conformal and confining gauge theories that are holographically realized in gravity by generic Einstein-Axion-Dilaton systems. In the vacuum our solutions describe RG flows from a conformal field theory in the UV to generic scaling solutions in the IR with generic hyperscaling violation and dynamical exponents $\theta$ and $z$. We formulate a generalization of the holographic c-theorem to the anisotropic case. At finite temperature, we discover that the anisotropic deformation reduces the confinement-deconfinement phase transition temperature suggesting a possible alternative explanation of inverse magnetic catalysis solely based on anisotropy. We also study transport and diffusion properties in anisotropic theories and observe in particular that the butterfly velocity that characterizes both diffusion and growth of chaos transverse to the anisotropic direction, saturates a constant value in the IR which can exceed the bound given by the conformal value.Comment: 6 pages, 4 figures; v2: minor improvements, references added, version accepted for publication in PR