15 research outputs found
Massive Schwinger model at finite
Using the approach developed in [V. Azcoiti, G. Di Carlo, A. Galante, V.
Laliena, \textit{Phys. Lett.} \textbf{B563}, (2003) 117], we are able to
reconstruct the behavior of the massive 1-flavor Schwinger model with a
term and a quantized topological charge. We calculate the full
dependence of the order parameter with . Our results at
are compatible with Coleman's conjecture on the phase diagram of this model.Comment: 8 pages, 8 figure
Performance Portability Strategies for Grid C++ Expression Templates
One of the key requirements for the Lattice QCD Application Development as
part of the US Exascale Computing Project is performance portability across
multiple architectures. Using the Grid C++ expression template as a starting
point, we report on the progress made with regards to the Grid GPU offloading
strategies. We present both the successes and issues encountered in using CUDA,
OpenACC and Just-In-Time compilation. Experimentation and performance on GPUs
with a SU(3)SU(3) streaming test will be reported. We will also report
on the challenges of using current OpenMP 4.x for GPU offloading in the same
code.Comment: 8 pages, 4 figures. Talk presented at the 35th International
Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spai
Disconnected quark loop contributions to nucleon observables using twisted clover fermions at the physical value of the light quark mass
We compute the disconnected quark loops contributions entering the
determination of nucleon observables, by using a ensemble of twisted
mass fermions with a clover term at a pion mass MeV. We employ
exact deflation and implement all calculations in GPUs, enabling us to achieve
large statistics and a good signal.Comment: 7 pages, 5 figures, presented at the 33rd International Symposium on
Lattice Field Theory, 14 -18 July 2015, Kobe, Japan, PoS(LATTICE 2015)13
Connected and disconnected contributions to nucleon axial form factors using twisted mass fermions at the physical point
We present results on the isovector and isoscalar nucleon axial form factors
including disconnected contributions,using an ensemble of twisted mass
clover- improved Wilson fermions simulated with approximately the physical
value of the pion mass. The light disconnected quark loops are computed using
exact deflation, while the strange and the charm quark loops are evaluated
using the truncated solver method. Techniques such as the summation and the
two-state fits have been employed to access ground-state dominance
Disconnected diagrams with twisted-mass fermions
The latest results from the Twisted-Mass collaboration on disconnected
diagrams at the physical value of the pion mass are presented. In particular,
we focus on the sigma terms, the axial charges and the momentum fraction, all
of them for the nucleon. A detailed error analysis for each observable follows,
showing the strengths and weaknesses of the one-end trick. Alternatives are
discussed.Comment: Proceedings of the 34th annual International Symposium on Lattice
Field Theory. 7 pages, 6 figure
Performance Portability Strategies for Grid C++ Expression Templates
One of the key requirements for the Lattice QCD Application Development as part of the US Exascale Computing Project is performance portability across multiple architectures. Using the Grid C++ expression template as a starting point, we report on the progress made with regards to the Grid GPU offloading strategies. We present both the successes and issues encountered in using CUDA, OpenACC and Just-In-Time compilation. Experimentation and performance on GPUs with a SU(3)Ă—SU(3) streaming test will be reported. We will also report on the challenges of using current OpenMP 4.x for GPU offloading in the same code
Connected and disconnected contributions to nucleon axial form factors using Nf = 2 twisted mass fermions at the physical point
We present results on the isovector and isoscalar nucleon axial form factors including disconnected contributions, using an ensemble of Nf = 2 twisted mass cloverimproved Wilson fermions simulated with approximately the physical value of the pion mass. The light disconnected quark loops are computed using exact deflation, while the strange and the charm quark loops are evaluated using the truncated solver method. Techniques such as the summation and the two-state fits have been employed to access ground-state dominance