SM&FT 2017 - The XVII Workshop on Statistical Mechanics and nonpertubative Field Theory

Session

Session 8

14 Dec 2017, 17:00

Centro Polifunzionale UniBA

Conveners

Session 8

• Michele Pepe (MIB)

82. A portable LQCD Monte Carlo code using MPI and OpenACC

Enrico Calore (FE)

14/12/2017, 17:00

HPC systems used by scientific communities often include different kind of accelerators, such as GPUs. Accelerators can deliver an higher level of performance for HPC workloads than ordinary CPUs, but in general they require to rewrite applications using specific programming frameworks. For example, many HPC clusters nowadays are based on NVIDIA GPUs requiring to use the CUDA framework, which...

55. Quantitative machine learning study of the critical 2D Ising model

Dr davide vadacchino (INFN Sezione di Pisa)

14/12/2017, 17:20

In the last few years, machine learning techniques have been applied to a large variety of classification problems. In this talk, we present a quantitative study of the critical behavior of an exactly solved model, the 2D Ising model, performed using a quadratic kernel Support Vector Machine. Under very mild assumptions, the critical exponents and the critical temperature are obtained with a...

43. Charm and beauty: Heavy quark physics from lattice QCD

Dr Jonna Koponen (INFN sezione di Roma Tor Vergata)

14/12/2017, 17:40

This is an excellent time to study heavy mesons that contain c and/or b quarks, as they are produced in abundance by B-factories and at LHCb. There are persistent discrepancies with Standard Model in the b to c semileptonic observables, for example the few-sigma anomalies in the so called R-ratios R(D), R(D*) and R(J/psi) recently announced by LHCb. Reliable Standard Model predictions of these...

40. Investigation of the topological properties of the CP^(N-1) model

Claudio Bonanno (University of Pisa and INFN - Pisa section)

14/12/2017, 18:00

We measured the theta-dependence of the vacuum energy density of the CP^(N-1) model up to O(theta^6) for N = 15, 21, 26 and 31 using Monte Carlo simulations. We then extrapolated the large-N limit of the topological susceptibility chi and of the higher-order coefficients b_2 and b_4 and compared it with the analytic results. In particular, we compared the leading term of the 1/N expansion of...

39. Spectral methods in Causal Dynamical Triangulations

Giuseppe Clemente (PI)

14/12/2017, 18:20

Causal Dynamical Triangulations is one of the present promising numerical approaches to the problem of Quantum Gravity. Motivated by the current lack of observables encoding geometric features at all scales, I will present a new set of observables based upon the analysis of eigenvalues and eigenvectors of the Laplace-Beltrami operator of triangulations, and discuss the main results obtained...

84. The effect of ‘contrarians’ on the emergence of collective intelligence in human groups

Mr Giovanni Francesco Massari (Politecnico di Bari)

14/12/2017, 18:40

A large number of numerical models have been proposed by researchers in order to investigate the effect of contrarian on opinion formation in groups. In this work we extend the Decision-Making Model (DMM), previously developed by the same authors, to show that under specific conditions the presence of ‘contrarians’, i.e. of anti-consensus social interactions, may increase the efficacy of human...