Browsing School of Engineering, Computing and Mathematics by Author "b0215cf222d44c538598f5def52be5f2"
Now showing items 119 of 19

Boundary and Interface CFTs from the Conformal Bootstrap
Gliozzi, F; Liendo, P; Meineri, M; Rago, A (20150225)We explore some consequences of the crossing symmetry for defect conformal field theories, focusing on codimension one defects like flat boundaries or interfaces. We study surface transitions of the 3d Ising and other ... 
BSMBench: A flexible and scalable HPC benchmark from beyond the standard model physics.
Bennett, E; Lucini, B; Debbio, LD; Jordan, KE; Patella, A; Pica, C; Rago, A (IEEE, 2016) 
BSMBench: a flexible and scalable supercomputer benchmark from computational particle physics
Bennett, E; Debbio, LD; Jordan, K; Lucini, B; Patella, A; Pica, C; Rago, A (20140115)Lattice Quantum ChromoDynamics (QCD), and by extension its parent field, Lattice Gauge Theory (LGT), make up a significant fraction of supercomputing cycles worldwide. As such, it would be irresponsible not to evaluate ... 
Computing general observables in lattice models with complex actions
Francesconi, O; Holzmann, M; Lucini, B; Rago, A; Rantaharju, J (20191209)The study of QFTs at finite density is hindered by the presence of the socalled sign problem. The action definition of such systems is, in fact, complexvalued making standard importance sampling Monte Carlo methods ... 
Computing the density of states with the global Hybrid Monte Carlo
Pellegrini, R; Lucini, B; Rago, A; Vadacchino, D (20160101)The LLR algorithm is a recent proposal for computing the density of states in lattice gauge theory. This algorithm has been tested in several bosonic models at zero and finite chemical potential with impressive results. ... 
Critical exponents of the 3d Ising and related models from Conformal Bootstrap
Gliozzi, F; Rago, A (20140324)The constraints of conformal bootstrap are applied to investigate a set of conformal field theories in various dimensions. The prescriptions can be applied to both unitary and non unitary theories allowing for the study ... 
Density of state method for complex action systems
Francesconi, O; Holzmann, M; Lucini, B; Rago, A (20200101)While importance sampling Monte Carlo algorithms have proved to be a crucial tool for numerical studies in modern physics, they fail when we consider complex action systems. The density of states approach provides a way ... 
The density of states approach for the simulation of finite density quantum field theories
Langfeld, K; Lucini, B; Rago, A; Pellegrini, R; Bongiovanni, L (20150302)Finite density quantum field theories have evaded first principle MonteCarlo simulations due to the notorious signproblem. The partition function of such theories appears as the Fourier transform of the generalised ... 
The density of states approach to the sign problem
Lucini, B; Francesconi, O; Holzmann, M; Rago, A (20190122)Approaches to the sign problem based on the density of states have been recently revived by the introduction of the LLR algorithm, which allows us to compute the density of states itself with exponential error reduction. ... 
Density of states in gauge theories
Langfeld, K; Lucini, B; Rago, A (20120911)The density of states is calculated for a SU(2) and a compact U(1) lattice gauge theory using a modified version of the WangLandau algorithm. We find that the density of states of the SU(2) gauge theory can be reliably ... 
Ergodic sampling of the topological charge using the density of states
Cossu, G; Lancaster, D; Lucini, B; Pellegrini, R; Rago, A (Springer Science and Business Media LLC, 202104)<jats:title>Abstract</jats:title><jats:p>In lattice calculations, the approach to the continuum limit is hindered by the severe freezing of the topological charge, which prevents ergodic sampling in configuration space. ... 
Ergodicity of the LLR method for the Density of States
Cossu, G; Lucini, B; Pellegrini, R; Rago, A (20171017)The LLR method is a novel algorithm that enables us to evaluate the density of states in lattice gauge theory. We present our study of the ergodicity properties of the LLR algorithm for the model of Yang Mills SU(3). We ... 
Free energy of the selfinteracting relativistic lattice Bose gas at finite density
Francesconi, O; Holzmann, M; Lucini, B; Rago, A (20191024)The density of state approach has recently been proposed as a potential route to circumvent the sign problem in systems at finite density. In this study, using the Linear Logarithmic Relaxation (LLR) algorithm, we extract ... 
Large volumes and spectroscopy of walking theories
Debbio, LD; Lucini, B; Patella, A; Pica, C; Rago, A (20151227)A detailed investigation of finite size effects is performed for SU(2) gauge theory with two fermions in the adjoint representation, which previous lattice studies have shown to be inside the conformal window. The system ... 
Lattice QCD on new chips: a community summary
Rago, A (20171103)I review the most recent evolutions of the QCD codes on new architectures, with a focus on the performances obtained by the different coding strategies as presented during the Lattice2017 conference. 
Masterfield simulations of O(a)improved lattice QCD: Algorithms, stability and exactness
Francis, A; Fritzsch, P; Lüscher, M; Rago, A (Elsevier BV, 202010) 
Renormalisation of the scalar energymomentum tensor with the Wilson flow
Capponi, F; Debbio, LD; Ehret, S; Pellegrini, R; Portelli, A; Rago, A (20161222)The nonperturbative computation of the energymomentum tensor can be used to study the scaling behaviour of strongly coupled quantum field theories. The Wilson flow is an essential tool to find a meaningful formulation ... 
Singlet channel scattering in a Composite Higgs model on the lattice
Drach, V; Fritzsch, P; Rago, A; RomeroLópez, F (20210721) 
Spacetime symmetries and the YangMills gradient flow
Debbio, LD; Patella, A; Rago, A (20130605)The recent introduction of the gradient flow has provided a new tool to probe the dynamics of quantum field theories. The latest developments have shown how to use the gradient flow for the exploration of symmetries, and ...