RG inspired Machine Learning for lattice field theoryMachine learning has been a fast growing field of research in several areas dealing with large datasets. We report recent attempts to use Renormalization Group (RG) ideas in the context of machine…S. Foreman, J. Giedt, Y. Meurice et al.·Oct 5, 2017SaveLearn
Job Management and Task BundlingHigh Performance Computing is often performed on scarce and shared computing resources. To ensure computers are used to their full capacity, administrators often incentivize large workloads that are…Evan Berkowitz, Gustav R. Jansen, Kenneth McElvain et al.·Oct 5, 2017SaveLearn
QCD flux tubes across the deconfinement phase transitionWe study the behavior across the deconfinement phase transition of the chromoelectric flux tube generated by a static quark and a static antiquark for several distances between them. We present…Paolo Cea, Leonardo Cosmai, Francesca Cuteri et al.·Oct 5, 2017SaveLearn
A study of how the particle spectra of SU(N) gauge theories with a fundamental Higgs emergeIn gauge theories, the physical, experimentally observable spectrum consists only of gauge-invariant states. In the standard model the Fröhlich-Morchio-Strocchi mechanism shows that these states can…Axel Maas, René Sondenheimer, Pascal Törek·Oct 5, 2017SaveLearn
The elastic I=3/2 p-wave nucleon-pion scattering amplitude and the Δ(1232) resonance from Nf=2+1 lattice QCDWe present the first direct determination of meson-baryon resonance parameters from a scattering amplitude calculated using lattice QCD. In particular, we calculate the elastic I=3/2, p-wave…Christian Walther Andersen, John Bulava, Ben Hörz et al.·Oct 4, 2017SaveLearn
Two dimensional super QCD on a latticeWe construct a lattice theory with one exact supersymmetry which consists of fields transforming in both the adjoint and fundamental representations of a U(Nc) gauge group. In addition to gluons and…Simon Catterall, Aarti Veernala·Oct 4, 2017SaveLearn
Pion decay in magnetic fieldsThe leptonic decay of the charged pion in the presence of background magnetic fields is investigated using quenched Wilson fermions. It is demonstrated that the magnetic field opens up a new channel…Gunnar S. Bali, Bastian B. Brandt, Gergely Endrodi et al.·Oct 4, 2017SaveLearn
Symmetry Properties of Nonlocal Quark Bilinear Operators on a LatticeUsing symmetry properties, we determine the mixing pattern of a class of nonlocal quark bilinear operators containing a straight Wilson line along a spatial direction. We confirm the previous study…Jiunn-Wei Chen, Tomomi Ishikawa, Luchang Jin et al.·Oct 3, 2017SaveLearn
High precision applications of lattice gauge theories in the quest for new physicsWe present some aspects of high precision calculations in the context of Lattice Quantum Field Theory. This work is a collection of three studies done during my Ph.D. period. First we present how to…Andrea Bussone·Oct 3, 2017SaveLearn
Spectroscopy of SU(4) composite Higgs theory with two distinct fermion representationsWe have simulated the SU(4) lattice gauge theory coupled to dynamical fermions in the fundamental and two-index antisymmetric (sextet) representations simultaneously. Such theories arise naturally in…Venkitesh Ayyar, Thomas DeGrand, Maarten Golterman et al.·Oct 2, 2017SaveLearn
Strong-Coupling Lattice QCD on Anisotropic LatticesAnisotropic lattice spacings are mandatory to reach the high temperatures where chiral symmetry is restored in the strong coupling limit of lattice QCD. Here, we propose a simple criterion for the…Philippe de Forcrand, Wolfgang Unger, Helvio Vairinhos·Oct 2, 2017SaveLearn
Lattice Landau gauge gluon propagator at finite temperature: non-zero Matsubara frequencies and spectral densitiesThe lattice Landau gauge gluon propagator at finite temperature is computed including the non-zero Matsubara frequencies. Furthermore, the Källén-Lehmann representation is inverted and the…Paulo J. Silva, Orlando Oliveira, David Dudal et al.·Oct 2, 2017SaveLearn
Baryons in the plasma: in-medium effects and parity doublingWe investigate the fate of baryons made out of u, d and s quarks in the hadronic gas and the quark-gluon plasma, using nonperturbative lattice simulations, employing the FASTSUM anisotropic Nf=2+1…Gert Aarts, Chris Allton, Davide de Boni et al.·Oct 2, 2017SaveLearn
One-loop perturbative coupling of A and A through the chiral overlap operatorRecently, Grabowska and Kaplan constructed a four-dimensional lattice formulation of chiral gauge theories on the basis of the chiral overlap operator. At least in the tree-level approximation, the…Hiroki Makino, Okuto Morikawa, Hiroshi Suzuki·Oct 2, 2017SaveLearn
One-dimensional QCD in thimble regularizationQCD in 0+1 dimensions is numerically solved via thimble regularization. In the context of this toy model, a general formalism is presented for SU(N) theories. The sign problem that the theory…F. Di Renzo, G. Eruzzi·Sep 29, 2017SaveLearn
QCD at finite isospin chemical potentialWe investigate the properties of QCD at finite isospin chemical potential at zero and non-zero temperatures. This theory is not affected by the sign problem and can be simulated using Monte-Carlo…Bastian B. Brandt, Gergely Endrodi, Sebastian Schmalzbauer·Sep 29, 2017SaveLearn
Observation of a Coulomb flux tubeIn Coulomb gauge there is a longitudinal color electric field associated with a static quark-antiquark pair. We have measured the spatial distribution of this field, and find that it falls off…Jeff Greensite, Kristian Chung·Sep 29, 2017SaveLearn
Singlet vs Nonsinglet Perturbative Renormalization factors of Staggered Fermion BilinearsIn this paper we present the perturbative computation of the difference between the renormalization factors of flavor singlet (ΣfψfΓψf, f: flavor index) and nonsinglet ($ψf1…Haralambos Panagopoulos, Gregoris Spanoudes·Sep 29, 2017SaveLearn
Topological critical slowing down: variations on a toy modelNumerical simulations of lattice quantum field theories whose continuum counterparts possess classical solutions with non-trivial topology face a severe critical slowing down as the continuum limit…Claudio Bonati, Massimo D'Elia·Sep 28, 2017SaveLearn
Relation between scattering amplitude and Bethe-Salpeter wave function in quantum field theoryWe reexamine the relations between the Bethe-Salpeter (BS) wave function of two particles, the on-shell scattering amplitude, and the effective potential in quantum filed theory. It is emphasized…Takeshi Yamazaki, Yoshinobu Kuramashi·Sep 28, 2017SaveLearn
Critical behavior of SU(3) lattice gauge theory with 12 light flavorsIt is expected that when the number of light flavors of gauge theories is increased near or beyond some critical value, new and interesting behavior occurs. We discuss the qualitative properties of…Y. Meurice·Sep 28, 2017SaveLearn
Fermion zero mode associated with instantonlike self-dual solution to lattice Euclidean gravityWe prove the existence of lattice fermion zero mode associated with self-dual lattice gravity solution.S. N. Vergeles·Sep 28, 2017SaveLearn
Fighting topological freezing in the two-dimensional CPN-1 modelWe perform Monte Carlo simulations of the CPN-1 model on the square lattice for N=10, 21, and 41. Our focus is on the severe slowing down related to instantons. To fight this problem we…Martin Hasenbusch·Sep 27, 2017SaveLearn
Current matrix element in HAL QCD's wave function equivalent potential methodWe give a formula to calculate a matrix element of a conserved current in the effective quantum mechanics defined by the wave function equivalent potentials proposed by HAL QCD collaboration. As a…Kai Watanabe, Noriyoshi Ishii·Sep 27, 2017SaveLearn
A linear sigma model for multiflavor gauge theoriesWe consider a linear sigma model describing 2Nf2 bosons (σ, a0, η' and π) as an approximate effective theory for a SU(3) local gauge theory with Nf Dirac fermions in…Y. Meurice·Sep 26, 2017SaveLearn