154 research outputs found
Finite size phase transitions in QCD with adjoint fermions
We perform a lattice investigation of QCD with three colors and 2 flavors of
Dirac (staggered) fermions in the adjoint representation, defined on a 4d space
with one spatial dimension compactified, and study the phase structure of the
theory as a function of the size Lc of the compactified dimension. We show that
four different phases take place, corresponding to different realizations of
center symmetry: two center symmetric phases, for large or small values of Lc,
separated by two phases in which center symmetry is broken in two different
ways; the dependence of these results on the quark mass is discussed. We study
also chiral properties and how they are affected by the different realizations
of center symmetry; chiral symmetry, in particular, stays spontaneously broken
at the phase transitions and may be restored at much lower values of the
compactification radius. Our results could be relevant to a recently proposed
conjecture of volume indepedence of QCD with adjoint fermions in the large Nc
limit.Comment: 9 pages, 12 figures; extended discussion about the chiral limit and
the chiral properties; 2 figures and references adde
QCD simulations with staggered fermions on GPUs
We report on our implementation of the RHMC algorithm for the simulation of
lattice QCD with two staggered flavors on Graphics Processing Units, using the
NVIDIA CUDA programming language. The main feature of our code is that the GPU
is not used just as an accelerator, but instead the whole Molecular Dynamics
trajectory is performed on it. After pointing out the main bottlenecks and how
to circumvent them, we discuss the obtained performances. We present some
preliminary results regarding OpenCL and multiGPU extensions of our code and
discuss future perspectives.Comment: 22 pages, 14 eps figures, final version to be published in Computer
Physics Communication
The Roberge-Weiss endpoint in N_f = 2 QCD
We present the results of extensive simulations regarding the critical
behavior at the endpoint of the Roberge-Weiss transition for N_f = 2 QCD. We
confirm early evidence, presented in arXiv:0909.0254, according to which the
Roberge-Weiss endpoint is first order in the limit of large or small quark
masses, and second order for intermediate masses. A systematic study of the
transition strength as a function of the quark mass in the first order regions,
permits us to estimate the tricritical values of the quark mass separating the
second order region from the first order ones.Comment: 10 pages, 20 figures. References and figures updated. Matches the
published versio
Staggered fermions simulations on GPUs
We present our implementation of the RHMC algorithm for staggered fermions on
Graphics Processing Units using the NVIDIA CUDA programming language. While
previous studies exclusively deal with the Dirac matrix inversion problem, our
code performs the complete MD trajectory on the GPU. After pointing out the
main bottlenecks and how to circumvent them, we discuss the performance of our
code.Comment: Poster presented at the XXVIII International Symposium on Lattice
Field Theory, June 14-19, 2010, Villasimius, Sardinia Ital
Removal of acetaldehyde from saliva by mucoadhesive formulations containing cysteine and chlorhexidine diacetate: a possible approach to the prevention of oral cavity alcohol-related cancer
The aim of our work
has been to develop buccoadhesive formulations (tablets) containing both L-cysteine and
chlorhexidine diacetate and to verify their ability to reduce oral acetaldehyde produced after
alcoholic drinks consumption
Confinement: group case
The gauge group being centreless, gauge theory is a good laboratory for
studying the role of the centre of the group for colour confinement in
Yang-Mills gauge theories. In this paper, we investigate pure gauge
theory at finite temperature on the lattice. By studying the finite size
scaling of the plaquette, the Polyakov loop and their susceptibilities, we show
that a deconfinement phase transition takes place. The analysis of the
pseudocritical exponents give strong evidence of the deconfinement transition
being first order. Implications of our findings for scenarios of colour
confinement are discussed.Comment: 6 pages, 4 figures, Proceedings of the The XXV International
Symposium on Lattice Field Theory, Regensburg August 200
How to Increase Stakeholders’ Involvement while Developing New Governance Model for Urban Logistic: Turin Best Practice
AbstractThis paper reports and describes the desirable effects obtained by the definition, acceptance and deployment of an innovative governance model introduced in Turin (Italy) where an original and well performing stakeholders’ engagement format was developed. A specific pilot has been implemented in order to stimulate – in vivo – the effects of the proposed new governance model. Pilot results did demonstrate that applying the new governance model, based on operational incentives rather than restrictions (pull rather than push measures), it was possible to achieve relevant and sound benefits for the community and an economic saving for each single logistic operator joining to the Recognition Scheme. On the base of such evidence, the City of Turin and Piedmont Region are considering to extend the governance model developed to neighbouring Municipalities. This will provide a fundamental base to build a homogeneous regional bottom-up Logistic Masterplan
Composizione polifenolica e capacitĂ Â antiradicalica "<i>in vitro</i>" di estratti di frutti di corbezzolo (<i>Arbutus unedo</i> L.) in differenti stadi di maturazione
La nostra ricerca attualmente in corso ha come obiettivo la valutazione dell'attivitĂ
antiossidante di specie vegetali tipiche delle coltivazioni o della flora spontanea della
Sardegna e la caratterizzazione chimica dei principali composti responsabili di tale attivitĂ
<i>In vitro</i> and <i>in vivo</i> studies of artichoke extract (<i>Cynara scolymus</i> L.) as ketoprofen skin penetration enhancer
In this study, the enhancing effect of artichoke extract containing cynaropicrin on the in
vitro and in vivo percutaneous absorption of ketoprofen from gels has been investigated
G_2 gauge theory at finite temperature
The gauge group being centreless, gauge theory is a good laboratory for
studying the role of the centre of the group for colour confinement in
Yang-Mills gauge theories. In this paper, we investigate pure gauge
theory at finite temperature on the lattice. By studying the finite size
scaling of the plaquette, the Polyakov loop and their susceptibilities, we show
that a deconfinement phase transition takes place. The analysis of the
pseudocritical exponents give strong evidence of the deconfinement transition
being first order. Implications of our findings for scenarios of colour
confinement are discussed.Comment: 17 pages, 8 figure
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