A5071220084- Theoretical and Computational Physics
- Parallel Computing and Optimization Techniques
- Lattice Boltzmann Simulation Studies
- Advanced Data Storage Technologies
- Complex Systems and Time Series Analysis
- Particle physics theoretical and experimental studies
- Generative Adversarial Networks and Image Synthesis
- Neutrino Physics Research
- Distributed and Parallel Computing Systems
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Material Dynamics and Properties
- Radiation Detection and Scintillator Technologies
- Complex Network Analysis Techniques
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Embedded Systems Design Techniques
- Aerosol Filtration and Electrostatic Precipitation
- Stochastic processes and statistical mechanics
- Fluid Dynamics and Turbulent Flows
- Image Enhancement Techniques
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Algorithms and Data Compression
University of Ferrara
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2015-2024
Istituto Nazionale di Fisica Nucleare
2002-2018
University of Naples Federico II
2015
National Interuniversity Consortium for the Physical Sciences of Matter
2010
Universidad de Extremadura
2009
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2009
Universidad Complutense de Madrid
2009
Instituto de Biocomputación y Física de Sistemas Complejos
2009
Universidad de Zaragoza
2009
We report a high-precision finite-size scaling study of the critical behavior three-dimensional Ising Edwards-Anderson model (the spin glass). have thermalized lattices up to L=40 using Janus dedicated computer. Our analysis takes into account leading-order corrections scaling. obtain Tc = 1.1019(29) for temperature, \nu 2.562(42) thermal exponent, \eta -0.3900(36) anomalous dimension and \omega 1.12(10) exponent leading Standard (hyper)scaling relations yield \alpha -5.69(13), \beta...
The Mpemba effect occurs when a hot system cools faster than an initially colder one, both are refrigerated in the same thermal reservoir. Using custom-built supercomputer Janus II, we study spin glasses and show that it is nonequilibrium process, governed by coherence length ξ of system. bath temperature lies glassy phase, but not necessary for protocol to cross critical temperature. In fact, follows from strong relationship between internal energy turns out be sure-tell sign being phase....
We present a massive equilibrium simulation of the three-dimensional Ising spin glass at low temperatures. The Janus special-purpose computer has allowed us to equilibrate, using parallel tempering, L = 32 lattices down T ≈ 0.64Tc. demonstrate relevance finite size simulations understanding experimental non-equilibrium glasses in thermodynamical limit by establishing time-length dictionary. conclude that experiments performed on timescale 1 h can be matched with results 110 lattices. A...
Recent trends in deep learning (DL) imposed hardware accelerators as the most viable solution for several classes of high-performance computing (HPC) applications such image classification, computer vision, and speech recognition. This survey summarizes classifies recent advances designing DL suitable to reach performance requirements HPC applications. In particular, it highlights advanced approaches support accelerations including not only GPU TPU-based but also design-specific FPGA-based...
We study numerically the nonequilibrium dynamics of Ising spin glass, for a time spanning 11 orders magnitude, thus approaching experimentally relevant scale (i.e., seconds). introduce novel analysis techniques to compute coherence length in model-independent way. present strong evidence replicon correlator and overlap equivalence. The emerging picture is compatible with noncoarsening behavior.
This paper describes JANUS, a modular massively parallel and reconfigurable FPGA-based computing system. Each JANUS module has computational core host. The is 4x4 array of processing elements with nearest-neighbor data links. Processors are also directly connected to an I/O node attached the host, conventional PC. tailored for, but not limited to, requirements class hard scientific applications characterized by regular code structure, unconventional manipulation instructions too large...
Spin glasses are a longstanding model for the sluggish dynamics that appears at glass transition. However, spin differ from structural crucial feature: they enjoy time reversal symmetry. This symmetry can be broken by applying an external magnetic field, but embarrassingly little is known about critical behaviour of in field. In this context, space dimension crucial. Simulations easier to interpret large number dimensions, one must work below upper (i.e., d<6) order results have relevance...
Abstract The Deep Underground Neutrino Experiment (DUNE) is a next generation experiment aimed to study neutrino oscillation. Its long-baseline configuration will exploit Near Detector (ND) and Far (FD) located at distance of ∼1300 km. FD consist four Liquid Argon Time Projection Chamber (LAr TPC) modules. A Photon Detection System (PDS) be used detect the scintillation light produced inside detector after interactions. PDS based on collectors coupled Silicon Photomultipliers (SiPMs)....
In this paper we report on our early experience porting, optimizing and benchmarking a Lattice Boltzmann (LB) code the Xeon-Phi co-processor, first generally available version of new Many Integrated Core (MIC) architecture, developed by Intel. We consider as test-bed state-of-the-art LB model, that accurately reproduces thermo-hydrodynamics 2D- fluid obeying equations state perfect gas. The regular structure algorithms makes it relatively easy to identify large degree parallelism. However,...
We perform equilibrium parallel-tempering simulations of the 3D Ising Edwards-Anderson spin glass in a field. A traditional analysis shows no signs phase transition. Yet, we encounter dramatic fluctuations behaviour model: Averages over all data only describe small fraction it. Therefore develop new approach to study system, by classifying measurements as function conditioning variate. propose finite-size scaling based on probability distribution variate, which may accelerate convergence...
Experiments on spin glasses can now make precise measurements of the exponent z(T) governing growth glassy domains, while our computational capabilities allow us to quantitative predictions for experimental scales. However, and numerical values have differed. We use new simulations Janus II computer resolve this discrepancy, finding a time-dependent z(T,t_{w}), which leads value through mild extrapolations. Furthermore, theoretical insight is gained by studying crossover between T=T_{c} T=0...
We find a dynamic effect in the non-equilibrium dynamics of spin glass that closely parallels equilibrium temperature chaos. This effect, we name chaos, is spatially heterogeneous to large degree. The key controlling quantity time-growing spin-glass coherence length. Our detailed characterization chaos paves way for analysis recent and forthcoming experiments. work has been made possible thanks most massive simulation date dynamics, carried out on Janus~II custom-built supercomputer.
The Global Ozone Monitoring Experiment 2 (GOME-2) and the TROPOspheric Instrument (TROPOMI) are two significant satellite-based instruments dedicated to monitoring Earth&#8217;s atmosphere. GOME-2, part of MetOp platform, has been operational since 2006, was originally developed monitor ozone layer in However, its onboard spectrometer can also detect pollutant gases, including NO2, which we will use as an initial example this study.GOME-2 spatial resolution is very coarse: a single data...
We first reproduce on the Janus and II computers a milestone experiment that measures spin-glass coherence length through lowering of free-energy barriers induced by Zeeman effect. Secondly, we determine scaling behavior allows quantitative analysis new reported in companion Letter [S. Guchhait R. Orbach, Phys. Rev. Lett. 118, 157203 (2017)]. The value estimated microscopic correlation functions turns out to be quantitatively consistent with its measurement macroscopic response functions....
We study the off-equilibrium dynamics of three-dimensional Ising spin glass in presence an external magnetic field. have performed simulations both at fixed temperature and with annealing protocol. Thanks to Janus special-purpose computer, based on FPGAs, we been able reach times equivalent 0.01 seconds experiments. studied system relaxation for high low temperatures, clearly identifying a dynamical transition point. This is strictly positive depends applied discuss different possibilities...
High-performance computing systems are more and often based on accelerators. Computing applications targeting those follow a host-driven approach in which hosts offload almost all compute-intensive sections of the code onto accelerators; this only marginally exploits computational resources available host CPUs, limiting performance energy efficiency. The obvious step forward is to run kernels concurrent balanced way both In paper we consider exactly problem for class Lattice Boltzmann...
The authors describe a VLSI processor for pattern recognition based on content addressable memory (CAM) architecture, optimized on-line track finding in high-energy physics experiments. A large CAM bank stores all trajectories of interest and extracts the ones compatible with given event. This task is naturally parallelized by architecture able to output identified trajectories, searching matches 96-bit wide patterns, just few 40-MHz clock cycles. We have developed this device (called...
We numerically study the aging properties of dynamical heterogeneities in Ising spin glass. find that a phase transition takes place during process. Statics-dynamics correspondence implies systems finite size equilibrium have static obey Finite-Size Scaling, thus signaling an analogous thermodynamical limit. compute critical exponents and point setting, use them to show dynamic can be described by Finite-Time Scaling Ansatz, with potential implications for experimental work.