Sigma resonance parameters from a Nf=2 lattice QCD simulationIn this work we present the analysis of the energy spectrum from a recent two-flavor (Nf=2) lattice QCD calculation for pion-pion scattering in the scalar, isoscalar channel (the σ-meson). The…R. Molina, D. Guo, A. Alexandru et al.·Apr 26, 2018SaveLearn
αs from the Lattice Hadronic Vacuum PolarisationWe present a determination of the QCD coupling constant, αs, obtained by fitting lattice results for the flavour ud hadronic vacuum polarisation function to continuum perturbation theory. We use…Renwick J. Hudspith, Randy Lewis, Kim Maltman et al.·Apr 26, 2018SaveLearn
Solving DWF Dirac Equation Using Multisplitting Preconditioned Conjugate GradientWe show that using the multisplitting algorithm as a preconditioner for conjugate gradient inversion of the domain wall Dirac operator could effectively reduce the inter- node communication cost, at…Duo Guo, Robert Mawhinney, Jiqun Tu·Apr 23, 2018SaveLearn
Non-Abelian vortex in lattice gauge theoryWe perform the Monte Carlo study of the SU(3) non-Abelian Higgs model. We discuss phase structure and non-Abelian vortices by gauge invariant operators. External magnetic fields induce non-Abelian…Arata Yamamoto·Apr 22, 2018SaveLearn
Lattice QCD and heavy ion collisions: a review of recent progressIn the last few years, numerical simulations of QCD on the lattice have reached a new level of accuracy. A wide range of thermodynamic quantities is now available in the continuum limit and for…Claudia Ratti·Apr 20, 2018SaveLearn
S-duality in lattice super Yang-MillsWe present a progress report on studying S-duality in lattice N=4 super Yang-Mills. This is being done through a computation of 1/2-BPS states on the Coulomb branch, especially the 't…Joel Giedt, Simon Catterall, Poul Damgaard et al.·Apr 20, 2018SaveLearn
Neutron magnetic polarisability with Landau mode operatorsThe application of a uniform background magnetic field makes standard quark operators utilising gauge-covariant Gaussian smearing inefficient at isolating the ground state nucleon at nontrivial field…Ryan Bignell, Jonathan Hall, Waseem Kamleh et al.·Apr 18, 2018SaveLearn
Lattice computation of the Dirac eigenvalue density in the perturbative regime of QCDThe eigenvalue spectrum ρ(λ) of the Dirac operator is numerically calculated in lattice QCD with 2+1 flavors of dynamical domain-wall fermions. In the high-energy regime, the discretization effects…Katsumasa Nakayama, Hidenori Fukaya, Shoji Hashimoto·Apr 18, 2018SaveLearn
The spectrum of an SU(3) gauge theory with a fundamental Higgs fieldIn gauge theories, the physical, experimentally observable spectrum consists only of gauge-invariant states. This spectrum can be different from the elementary spectrum even at weak coupling and in…Axel Maas, Pascal Törek·Apr 12, 2018SaveLearn
Temperature dependence of bulk viscosity within lattice simulation of SU(3)--gluodynamicsIn this paper the temperature dependence of the SU(3)--gluodynamics bulk viscosity is studied within lattice simulations. To carry out this study we measure the correlation function of the trace of…N. Yu. Astrakhantsev, V. V. Braguta, A. Yu. Kotov·Apr 6, 2018SaveLearn
Slope of the beta function at the fixed point of SU(2) gauge theory with six or eight flavorsWe consider measurement of the leading irrelevant scaling exponent γg, given by the slope of the beta function, at the fixed point of SU(2) gauge theory with six or eight flavors. We use the…Viljami Leino, Kari Rummukainen, Kimmo Tuominen·Apr 6, 2018SaveLearn
Implicit schemes for real-time lattice gauge theoryWe develop new gauge-covariant implicit numerical schemes for classical real-time lattice gauge theory. A new semi-implicit scheme is used to cure a numerical instability encountered in…Andreas Ipp, David Müller·Apr 5, 2018SaveLearn
Finite density condensation and scattering data - a study in ϕ4 lattice field theoryWe study the quantum field theory of a charged ϕ4 field in lattice regularization at finite density and low temperature in 2 and 4 dimensions with the goal of analyzing the connection of…Christof Gattringer, Mario Giuliani, Oliver Orasch·Apr 4, 2018SaveLearn
First direct lattice-QCD calculation of the x-dependence of the pion parton distribution functionWe present the first direct lattice-QCD calculation of the Bjorken-x dependence of the valence quark distribution of the pion. Using large-momentum effective theory (LaMET), we calculate the…Jian-Hui Zhang, Jiunn-Wei Chen, Luchang Jin et al.·Apr 4, 2018SaveLearn
Low Energy Spectrum of SU(2) Lattice Gauge Theory: An Alternate Proposal via Loop FormulationWe show that, prepotential formulation of gauge theories on honeycomb lattice yields local loop states, which are free from any spurious loop degrees of freedom and hence exact and orthonormal. We…Indrakshi Raychowdhury·Apr 4, 2018SaveLearn
Finite-Density Monte Carlo Calculations on Sign-Optimized ManifoldsWe present a general technique for addressing sign problems that arise in Monte Carlo simulations of field theories. This method deforms the domain of the path integral to a manifold in complex field…Andrei Alexandru, Paulo Bedaque, Henry Lamm et al.·Apr 2, 2018SaveLearn
On decay width of heavy quarkonia in QGPQuarkonia are some of the most important probes of the medium created in relativistic heavy ion collision experiments, but it is still difficult to get quantitative results for its behavior in the…Saumen Datta·Mar 30, 2018SaveLearn
Quantum simulation of the universal features of the Polyakov loopLattice gauge theories are fundamental to our understanding of high-energy physics. Nevertheless, the search for suitable platforms for their quantum simulation has proven difficult. We show that the…Jin Zhang, J. Unmuth-Yockey, J. Zeiher et al.·Mar 29, 2018SaveLearn
Structure of hybrid static potential flux tubes in SU(2) lattice Yang-Mills theoryWe study the structure of the hybrid static potential flux tube in the Πu sector in SU(2) lattice Yang-Mills theory. To this end, we compute the squares of the chromoelectric and chromomagnetic…Lasse Mueller, Marc Wagner·Mar 29, 2018SaveLearn
MC simulations of O(2)ϕ4 theory in three dimensions with worm algorithmWe study the critical region of the O(2)\,ϕ4 theory by means of Monte Carlo simulations on the lattice. In particular we determine the ratio Δϕ2c/g in order to estimate the first…Barbara De Palma, Marco Guagnelli·Mar 28, 2018SaveLearn
A non-perturbative exploration of the high energy regime in Nf=3 QCDUsing continuum extrapolated lattice data we trace a family of running couplings in three-flavour QCD over a large range of scales from about 4 to 128 GeV. The scale is set by the finite space time…Mattia Dalla Brida, Patrick Fritzsch, Tomasz Korzec et al.·Mar 27, 2018SaveLearn
Some hadronic parameters of charmonia in Nf=2 lattice QCDThe phenomenology of leptonic decays of quarkonia holds many interesting features: for instance, it can establish constraints on scenarios beyond the Standard Model with the Higgs sector enriched by…Gabriela Bailas, Benoît Blossier, Vincent Morénas·Mar 26, 2018SaveLearn
Reweighting Lefschetz ThimblesOne of the main challenges in simulations on Lefschetz thimbles is the computation of the relative weights of contributing thimbles. In this paper we propose a solution to that problem by means of…Stefan Bluecher, Jan M. Pawlowski, Manuel Scherzer et al.·Mar 22, 2018SaveLearn
Lattice ϕ4 Field Theory on Riemann Manifolds: Numerical Tests for the 2-d Ising CFT on S2We present a method for defining a lattice realization of the ϕ4 quantum field theory on a simplicial complex in order to enable numerical computation on a general Riemann manifold. The procedure…Richard C. Brower, Michael Cheng, George T. Fleming et al.·Mar 22, 2018SaveLearn
Direct computational approach to lattice supersymmetric quantum mechanicsWe propose a numerical method of estimating various physical quantities in lattice (supersymmetric) quantum mechanics. The method consists only of deterministic processes such as computing a product…Daisuke Kadoh, Katsumasa Nakayama·Mar 21, 2018SaveLearn