openQ*D code: a versatile tool for QCD+QED simulations

openQ*D simulation code for QCD+QED

The openQ*D code for the simulation of QCD+QED with C$^\star$ boundary conditions is presented. This code is based on openQCD-1.6, from which it inherits the core features that ensure its efficiency: the locally-deflated SAP-preconditioned GCR solver, the twisted-mass frequency splitting of the fermion action, the multilevel integrator, the 4th order OMF integrator, the SSE/AVX intrinsics, etc. The photon field is treated as fully dynamical and C$^\star$ boundary conditions can be chosen in the spatial directions. We discuss the main features of openQ*D, and we show basic test results and perf…

Performance optimizations for porting the openQ$^\star$D package to GPUs

OpenQ$^\star$D code has been used by the RC$^\star$ collaboration for the generation of fully dynamical QCD+QED gauge configurations with C$^\star$ boundary conditions. In this talk, optimization of solvers provided with the openQ$^\star$D package relevant for porting the code on GPU-accelerated supercomputing platforms is discussed. We present the analysis of the current implementations of the GCR solver preconditioned with Schwarz alternating procedure for ill-conditioned Dirac-operators. With the goal of enabling support for GPUs from various vendors, a novel method of adaptive CPU/GPU-hybr…

$O(a)$-改进的QCD+QED Wilson Dirac算子在GPU上的实现

$O(a)$-improved QCD+QED Wilson Dirac operator on GPUs

本研究将格点QCD+QED Dirac算子求逆卸载至GPU，利用QUDA库实现显著加速，最小化扩展并提升性能可移植性，为前百亿亿次计算及含QED效应的精密物理预测奠定基础。

C周期边界条件下的重子质量

Baryon masses with C-periodic boundary conditions

利用C周期边界条件的QCD+QED模拟，首次计算了Ω^-重子两点函数的部分连通贡献，并在非物理π介子质量约400 MeV的QCD系综上给出了重子质量的初步结果。

QCD+QED中重子质量的部分连接贡献

Partially connected contributions to baryon masses in QCD+QED

本文研究QCD+QED模拟中C周期边界条件引入的部分连接贡献对重子质量的影响，并提出结合点源与随机源反演计算$Ω^-$重子质量修正的方法。

$N_f = 1+2+1$ QCD+QED simulations with C$^\star$ boundary conditions

We give an update on the ongoing effort of the RC$^\star$ collaboration to generate fully dynamical QCD+QED configurations with C$^\star$ boundary conditions using the openQ$^\star$D code. The simulations are tuned to the U-symmetric point ($m_d=m_s$) with pions at $m_{π^\pm}\approx 400$ MeV. The splitting of the light mesons is used as one of three tuning observables and fixed to $m_{K^0} - m_{K^\pm} \approx 5$ MeV and $m_{K^0} - m_{K^\pm} \approx 25$ MeV on ensembles with renormalized electromagnetic coupling $α_\mathrm{R} \approx α_\mathrm{phys.}$ and $α_\mathrm{R}\approx 5.5 α_\mathrm{phys…