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Barbara De Palma

Publications and source records attributed to Barbara De Palma.

5 recordsLinked to original sources
arXiv2018

A Python program for the implementation of the Γ-method for Monte Carlo simulations

We present a modular analysis program written in Python devoted to the estimation of autocorrelation times for Monte Carlo simulations by means of the $Γ$-method algorithm. We give a brief review of this method and describe the main features of the program. The latter is characterized by a user-friendly interface and an open source environment which, along with its modularity, make it a versatile tool. Finally we present a simple application as an operational test for the program.

hep-lat↗
arXiv2018

New MC determination of the critical coupling in $ϕ^4_2$ theory

We investigate the non-perturbative features of $ϕ^4_2$ theory in two dimensions, using Monte Carlo lattice methods. In particular we determine the ratio $f_0 \equiv g/μ^2$, where g is the unrenormalised coupling, in the infinite volume and continuum limit. Our final result is $f_0$ = 11.055(14).

hep-lat↗
arXiv2016

Monte Carlo simulation of $ϕ^4_2$ and $O(N)ϕ^4_3$ theories

We report lattice simulations of $ϕ^4_2$ and $O(N)\,ϕ^4$ models, performed by means of a Monte Carlo method based on the all-order strong coupling expansion (worm algorithm). The investigation of the non-perturbative features of the $ϕ^4$ continuum limit in two dimensions lead us to the result $g/μ^2 = 11.15 \pm 0.06_{stat} \pm 0.03_{syst}$ for the critical coupling. Furthermore we present preliminary results for the three-dimensional $O(2)ϕ^4\,$ model using the worm algorithm with the extention to $O(N)ϕ^4\,$ in $D$ dimensions.

hep-lat↗
arXiv2015

Monte Carlo determination of the critical coupling in $ϕ^4_2$ theory

We use lattice formulation of $ϕ^4$ theory in order to investigate non--perturbative features of its continuum limit in two dimensions. In particular, by means of Monte Carlo calculations, we obtain the critical coupling constant $g/μ^2$ in the continuum, where $g$ is the {\em unrenormalised} coupling. Our final result is $g/μ^2=11.15(6)(3)$.

hep-lat↗