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Dive into the research topics where D. Iñiguez is active.

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Featured researches published by D. Iñiguez.


PLOS ONE | 2011

Structural and Dynamical Patterns on Online Social Networks: The Spanish May 15th Movement as a Case Study

Javier Borge-Holthoefer; Alejandro Rivero; Iñigo García; Elisa Cauhé; Alfredo Ferrer; Darío Ferrer; David Francos; D. Iñiguez; María Pilar Pérez; Gonzalo Ruiz; Francisco Javier Pérez Sanz; Fermín Serrano; Cristina Viñas; A. Tarancón; Yamir Moreno

The number of people using online social networks in their everyday life is continuously growing at a pace never saw before. This new kind of communication has an enormous impact on opinions, cultural trends, information spreading and even in the commercial success of new products. More importantly, social online networks have revealed as a fundamental organizing mechanism in recent country-wide social movements. In this paper, we provide a quantitative analysis of the structural and dynamical patterns emerging from the activity of an online social network around the ongoing May 15th (15M) movement in Spain. Our network is made up by users that exchanged tweets in a time period of one month, which includes the birth and stabilization of the 15M movement. We characterize in depth the growth of such dynamical network and find that it is scale-free with communities at the mesoscale. We also find that its dynamics exhibits typical features of critical systems such as robustness and power-law distributions for several quantities. Remarkably, we report that the patterns characterizing the spreading dynamics are asymmetric, giving rise to a clear distinction between information sources and sinks. Our study represents a first step towards the use of data from online social media to comprehend modern societal dynamics.


Physical Review B | 2013

Critical parameters of the three-dimensional Ising spin glass

Marco Baity-Jesi; Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; D. Iñiguez; A. Maiorano; F. Mantovani; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; A. Muñoz Sudupe; D. Navarro; Giorgio Parisi; S. Perez-Gaviro; Marcello Pivanti; Federico Ricci-Tersenghi; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; R. Tripiccione; D. Yllanes

We report a high-precision finite-size scaling study of the critical behavior of the three-dimensional Ising Edwards-Anderson model (the Ising spin glass). We have thermalized lattices up to L = 40 using the Janus dedicated computer. Our analysis takes into account leading-order corrections to scaling. We obtain Tc = 1.1019(29) for the critical temperature, ν = 2.562(42) for the thermal exponent, η = −0.3900(36) for the anomalous dimension, and ω = 1.12(10) for the exponent of the leading corrections to scaling. Standard (hyper)scaling relations yield α = −5.69(13), β = 0.782(10), and γ = 6.13(11). We also compute several universal quantities at Tc.


Proceedings of the National Academy of Sciences of the United States of America | 2012

Thermodynamic glass transition in a spin glass without time-reversal symmetry

Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; M. Guidetti; D. Iñiguez; A. Maiorano; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; Antonio Muñoz Sudupe; D. Navarro; Giorgio Parisi; S. Perez-Gaviro; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; P. Tellez; R. Tripiccione; D. Yllanes

Spin glasses are a longstanding model for the sluggish dynamics that appear at the glass transition. However, spin glasses differ from structural glasses in a crucial feature: they enjoy a time reversal symmetry. This symmetry can be broken by applying an external magnetic field, but embarrassingly little is known about the critical behavior of a spin glass in a field. In this context, the space dimension is crucial. Simulations are easier to interpret in a large number of dimensions, but one must work below the upper critical dimension (i.e., in d < 6) in order for results to have relevance for experiments. Here we show conclusive evidence for the presence of a phase transition in a four-dimensional spin glass in a field. Two ingredients were crucial for this achievement: massive numerical simulations were carried out on the Janus special-purpose computer, and a new and powerful finite-size scaling method.


European Physical Journal-special Topics | 2012

Reconfigurable computing for Monte Carlo simulations: results and prospects of the Janus project

Marco Baity-Jesi; Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; M. Guidetti; D. Iñiguez; A. Maiorano; F. Mantovani; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; A. Muñoz Sudupe; D. Navarro; Giorgio Parisi; Marcello Pivanti; S. Perez-Gaviro; Federico Ricci-Tersenghi; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; P. Tellez; R. Tripiccione; D. Yllanes

We describe Janus, a massively parallel FPGA-based computer optimized for the simulation of spin glasses, theoretical models for the behavior of glassy materials. FPGAs (as compared to GPUs or many-core processors) provide a complementary approach to massively parallel computing. In particular, our model problem is formulated in terms of binary variables, and floating-point operations can be (almost) completely avoided. The FPGA architecture allows us to run many independent threads with almost no latencies in memory access, thus updating up to 1024 spins per cycle. We describe Janus in detail and we summarize the physics results obtained in four years of operation of this machine; we discuss two types of physics applications: long simulations on very large systems (which try to mimic and provide understanding about the experimental non-equilibrium dynamics), and low-temperature equilibrium simulations using an artificial parallel tempering dynamics. The time scale of our non-equilibrium simulations spans eleven orders of magnitude (from picoseconds to a tenth of a second). On the other hand, our equilibrium simulations are unprecedented both because of the low temperatures reached and for the large systems that we have brought to equilibrium. A finite-time scaling ansatz emerges from the detailed comparison of the two sets of simulations. Janus has made it possible to perform spin-glass simulations that would take several decades on more conventional architectures. The paper ends with an assessment of the potential of possible future versions of the Janus architecture, based on state-of-the-art technology.


Computer Physics Communications | 2014

Janus II: A new generation application-driven computer for spin-system simulations

Marco Baity-Jesi; Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; D. Iñiguez; A. Maiorano; F. Mantovani; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; A. Muñoz Sudupe; D. Navarro; Giorgio Parisi; S. Perez-Gaviro; Marcello Pivanti; Federico Ricci-Tersenghi; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; R. Tripiccione; D. Yllanes

This paper describes the architecture, the development and the implementation of Janus II, a new generation application-driven number cruncher optimized for Monte Carlo simulations of spin systems (mainly spin glasses). This domain of computational physics is a recognized grand challenge of high-performance computing: the resources necessary to study in detail theoretical models that can make contact with experimental data are by far beyond those available using commodity computer systems. On the other hand, several specific features of the associated algorithms suggest that unconventional computer architectures – that can be implemented with available electronics technologies – may lead to order of magnitude increases in performance, reducing to acceptable values on human scales the time needed to carry out simulation campaigns that would take centuries on commercially available machines. Janus II is one such machine, recently developed and commissioned, that builds upon and improves on the successful JANUS machine, which has been used for physics since 2008 and is still in operation today. This paper describes in detail the motivations behind the project, the computational requirements, the architecture and the implementation of this new machine and compares its expected performances with those of currently available commercial systems.


Nuclear Physics | 1993

The U(1)-Higgs model: critical behaviour in the confining-Higgs region

J.L. Alonso; V. Azcoiti; Isabel Campos; J.C. Ciria; A. Cruz; D. Iñiguez; F. Lesmes; C.E. Piedrafita; A. Rivero; A. Tarancón; D. Badoni; L. A. Fernandez; A. Muǹoz Sudupe; J. J. Ruiz-Lorenzo; Antonio Gonzalez-Arroyo; P. Martínez; J. Pech; P. Tellez

Abstract We study numerically the critical properties of the U(1)-Higgs lattice model, with fixed Higgs modulus, in the region of small gauge coupling where the Higgs and confining phases merge. We find evidence for a first-order transition line that ends in a second-order point. By means of a rotation in parameter space we introduce thermodynamic magnitudes and critical exponents in close resemblance with simple models that show analogous critical behaviour. The measured data allow us to fit the critical exponents finding values in agreement with the mean-field prediction. The location of the critical point and the slope of the first-order line are accurately measured.


Physical Review E | 2014

Dynamical transition in the D=3 Edwards-Anderson spin glass in an external magnetic field.

Marco Baity-Jesi; Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; D. Iñiguez; A. Maiorano; F. Mantovani; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; A. Muñoz Sudupe; D. Navarro; Giorgio Parisi; S. Perez-Gaviro; Marcello Pivanti; Federico Ricci-Tersenghi; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; R. Tripiccione; D. Yllanes

We study the off-equilibrium dynamics of the three-dimensional Ising spin glass in the presence of an external magnetic field. We have performed simulations both at fixed temperature and with an annealing protocol. Thanks to the Janus special-purpose computer, based on field-programmable gate array (FPGAs), we have been able to reach times equivalent to 0.01 s in experiments. We have studied the system relaxation both for high and for low temperatures, clearly identifying a dynamical transition point. This dynamical temperature is strictly positive and depends on the external applied magnetic field. We discuss different possibilities for the underlying physics, which include a thermodynamical spin-glass transition, a mode-coupling crossover, or an interpretation reminiscent of the random first-order picture of structural glasses.


Physics Letters B | 1993

Instanton-like contributions to the dynamics of Yang-Mills fields on the twisted torus

M. García Pérez; Antonio Gonzalez-Arroyo; P Martńez; L. A. Fernandez; A. Muñoz Sudupe; J. J. Ruiz-Lorenzo; V. Azcoiti; Isabel Campos; J.C. Ciria; A. Cruz; D. Iñiguez; F. Lesmes; C.E. Piedrafita; A. Rivero; A. Tarancón; P. Tellez; D. Badoni; J. Pech

Abstract We study SU(2) lattice gauge theory in small volumes and with twist m = (1, 1, 1) . We investigate the presence of the periodic instantons of Q = 1 2 and determine their free energy and their contribution to the splitting of energy flux sectors E( e = (1, 1, 1)) − E( e = (0, 0, 0)) .


Journal of Statistical Mechanics: Theory and Experiment | 2014

The three-dimensional Ising spin glass in an external magnetic field: The role of the silent majority

Marco Baity-Jesi; Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; D. Iñiguez; A. Maiorano; F. Mantovani; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; A. Muñoz Sudupe; D. Navarro; Giorgio Parisi; S. Perez-Gaviro; M Pivanti; Federico Ricci-Tersenghi; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; R. Tripiccione; D. Yllanes

We perform equilibrium parallel-tempering simulations of the 3D Ising Edwards-Anderson spin glass in a field, using the Janus computer. A traditional analysis shows no signs of a phase transition. Yet, we encounter dramatic fluctuations in the behaviour of the model: Averages over all the data only describe the behaviour of a small fraction of it. Therefore we develop a new approach to study the equilibrium behaviour of the system, by classifying the measurements as a function of a conditioning variate. We propose a finite-size scaling analysis based on the probability distribution function of the conditioning variate, which may accelerate the convergence to the thermodynamic limit. In this way, we find a non-trivial spectrum of behaviours, where a part of the measurements behaves as the average, while the majority of them shows signs of scale invariance. As a result, we can estimate the temperature interval where the phase transition in a field ought to lie, if it exists. Although this would be critical regime is unreachable with present resources, the numerical challenge is finally well posed.


Physical Review B | 2011

Sample-to-sample fluctuations of the overlap distributions in the three-dimensional Edwards-Anderson spin glass

Raquel A. Baños; A. Cruz; L. A. Fernandez; J. M. Gil-Narvion; A. Gordillo-Guerrero; M. Guidetti; D. Iñiguez; A. Maiorano; F. Mantovani; Enzo Marinari; V. Martin-Mayor; J. Monforte-Garcia; A. Muñoz Sudupe; D. Navarro; Giorgio Parisi; S. Perez-Gaviro; Federico Ricci-Tersenghi; J. J. Ruiz-Lorenzo; Sebastiano Fabio Schifano; B. Seoane; A. Tarancón; R. Tripiccione; D. Yllanes

We study the sample-to-sample fluctuations of the overlap probability densities from large-scale equilibrium simulations of the three-dimensional Edwards-Anderson spin glass below the critical temperature. Ultrametricity, stochastic stability, and overlap equivalence impose constraints on the moments of the overlap probability densities that can be tested against numerical data. We found small deviations from the Ghirlanda Guerra predictions, which get smaller as system size increases. We also focus on the shape of the overlap distribution, comparing the numerical data to a mean-field-like prediction in which finite-size effects are taken into account by substituting delta functions with broad peaks.

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L. A. Fernandez

Complutense University of Madrid

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A. Cruz

University of Zaragoza

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Giorgio Parisi

Sapienza University of Rome

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D. Navarro

University of Zaragoza

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V. Martin-Mayor

Complutense University of Madrid

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A. Maiorano

Sapienza University of Rome

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