40 citations · 103 across the 15 of their papers we have counts for
22 papers
Optimised Distillation for Nucleon Correlation Functions
J. A. Crawford, J. Finkenrath, L. Barca
The calculation and analysis of nucleon correlation functions is essential for understanding the observed spectra and structure of these ubiquitous hadrons. Two challenges arise in…
Subtraction method for disconnected diagrams in full QCD
Lorenzo Barca, Joshua Crawford, Jacob Finkenrath +2
Disconnected diagrams remain a major challenge for precision lattice QCD calculations because of their large statistical fluctuations. We investigate a subtraction method based on…
Mixing of heavy and light quarks in charmonium and light mesons
Francesco Knechtli, Jacob Finkenrath, Roman Höllwieser +3
We study the system of light mesons, charmonium and glueballs in the flavor singlet scalar channel where they can mix. We use lattice QCD simulations with an almost physical charm…
S-wave flavor-singlet meson mixing in QCD with light and charm quarks
Juan Andrés Urrea-Niño, Jacob Finkenrath, Roman Höllwieser +3
We investigate the mixing between flavor-singlet light meson and charmonium operators in the S-wave channels, i.e. pseudo-scalar and vector channel, at two different pion masses. W…
Numerical stability of force-gradient integrators and their Hessian-free variants in lattice QCD simulations
Kevin Schäfers, Jacob Finkenrath, Michael Günther +1
A comprehensive linear stability analysis of force-gradient integrators and their Hessian-free variants is carried out by investigating the harmonic oscillator as a test equation.…
Flavor mixing in charmonium and light mesons with optimal distillation profiles
Juan Andrés Urrea-Niño, Jacob Finkenrath, Roman Höllwieser +3
We study the light meson - charmonium - glueball mixing using flavor-singlet meson operators built from optimal distillation profiles together with purely gluonic operators in diff…
Update on two-level sampling for glueball observables in quenched QCD
Lorenzo Barca, Jacob Finkenrath, Francesco Knechtli +3
We report our progress in combining a two-level sampling algorithm with distillation techniques for calculations of disconnected diagrams in quenched QCD. The simulations are perfo…
Hessian-free force-gradient integrators and their application to lattice QCD simulations
Kevin Schäfers, Jacob Finkenrath, Michael Günther +1
We present initial results on Hessian-free force-gradient integrators for lattice field theories. Integrators of this framework promise to provide substantial performance enhanceme…
Hessian-free force-gradient integrators
Kevin Schäfers, Jacob Finkenrath, Michael Günther +1
We propose a new framework of Hessian-free force-gradient integrators that do not require the analytical expression of the force-gradient term based on the Hessian of the potential…
Charmonium spectroscopy with optimal distillation profiles
Juan Andrés Urrea-Niño, Jacob Finkenrath, Roman Höllwieser +3
We use the method of optimal distillation profiles to compute the low-lying charmonium spectrum in an ensemble at the light flavor symmetric point ($m_π \approx…
How perturbative are heavy sea quarks?
Andreas Athenodorou, Jacob Finkenrath, Francesco Knechtli +4
Effects of heavy sea quarks on the low energy physics are described by an effective theory where the expansion parameter is the inverse quark mass, 1/. At leading order in 1/…
Adapted nested force-gradient integrators: the Schwinger model case
Dmitry Shcherbakov, Matthias Ehrhardt, Jacob Finkenrath +3
We study a novel class of numerical integrators, the adapted nested force-gradient schemes, used within the molecular dynamics step of the Hybrid Monte Carlo (HMC) algorithm. We te…
Perturbative versus non-perturbative decoupling of heavy quarks
Francesco Knechtli, Mattia Bruno, Jacob Finkenrath +2
We simulate a theory with heavy quarks of mass . At energies much smaller than the heavy quarks decouple and the theory can be described by an effective theory which…
Tuning of the strange quark mass with optimal reweighting
Björn Leder, Jacob Finkenrath
Quark mass reweighting can be used to tune the mass of dynamical quarks. The basic idea is to use gauge field ensembles generated at some bare mass parameters to evaluate observabl…
Isospin Effects by Mass Reweighting
Jacob Finkenrath, Francesco Knechtli, Björn Leder
Most of today's lattice simulations are performed in the isospin symmetric limit of the light quark sector. Mass reweighting is a technique to include effects of isospin breaking i…
Physical and cut-off effects of heavy sea quarks
Francesco Knechtli, Andreas Athenodorou, Mattia Bruno +4
We simulate a theory with two dynamical O() improved Wilson quarks whose mass ranges from a factor eight up to a factor two below the charm quark mass and at three values of…
On the effects of heavy sea quarks at low energies
Mattia Bruno, Jacob Finkenrath, Francesco Knechtli +2
We present a factorisation formula for the dependence of light hadron masses and low energy hadronic scales on the mass of a heavy quark: apart from an overall factor , rati…
One flavor mass reweighting: foundations
Björn Leder, Jacob Finkenrath, Francesco Knechtli
Reweighting is not a new method in lattice QCD, but a comprehensive analysis is missing in the literature. We close this gap by presenting: (i) a proof of an integral representatio…
One flavor mass reweighting in lattice QCD
Jacob Finkenrath, Francesco Knechtli, Björn Leder
One flavor mass reweighting can be used in lattice QCD computations to fine tune the quark masses to their physical values. We present a new method that utilizes an unbiased stocha…
Application of Domain Decomposition to the Evaluation of Fermion Determinant Ratios
Jacob Finkenrath, Francesco Knechtli, Björn Leder
We analyze the fluctuations in the case of mass reweighting for N_f=2 Wilson fermions. We use a domain decomposition factorization of the fermion determinant. Ratios of determinant…
Fermions as Global Correction: the QCD Case
Jacob Finkenrath, Francesco Knechtli, Björn Leder
It is widely believed that the fermion determinant cannot be treated in global acceptance-rejection steps of gauge link configurations that differ in a large fraction of the links.…
Fermions as global correction in lattice QCD
Jacob Finkenrath, Francesco Knechtli, Björn Leder
The fermion determinant is a highly non-local object and its logarithm is an extensive quantity. For these reasons it is widely believed that the determinant cannot be treated in a…