Mon·Aug 30, 2021Monday·August 30, 2021

1. 01*

   An update on QCD+QED simulations with C* boundary conditions

   Lucius Bushnaq🇮🇪 · Isabel Campos🇪🇸 · Marco Catillo🇨🇭 · Alessandro Cotellucci🇩🇪 · Madeleine Dale🇮🇹 · Patrick Fritzsch🇮🇪 · Jens Lücke · Marina Krstić Marinković🇨🇭 · Agostino Patella🇩🇪 · Nazario Tantalo🇮🇹

   We present two novelties in our analysis of fully dynamical QCD+QED ensembles with C* boundary conditions. The first one is the explicit computation of the sign of the Pfaffian. We present an algorithm that provides a significant speedup compared to traditional methods. The second one is a reweighting of the mass in the context of the RHMC. We have tested the techniques on both pure QCD and QCD+QED ensembles with pions at $m_{{\pi }^{\pm }}\approx 400$ MeV, a lattice spacing of $a\approx 0.05$ fm, a fine-structure constant of ${\alpha }_{\mathrm{R}}=0$ and $0.04$.

   hep-latPoS(2022)·7 citations
2. 02*

   Finite-density lattice QCD and sign problem: current status and open problems

   Keitaro Nagata🇯🇵

   This an English translation of a review of finite-density lattice QCD. The original version in Japanese appeared in Soryushiron Kenkyu Vol 31 (2020) No. 1.

   hep-lathep-phhep-thnucl-thPPNP(2022)·233 citations
3. 03*

   Digital quantum simulation and Pseudoquantum Simulation of ${\mathbb{Z}}_2$ Gauge Higgs Model

   Yiming Ding🇨🇳 · Xiaopeng Cui🇨🇳 · Yu Shi🇨🇳

   We present a quantum algorithm for digital quantum simulation of the ${\mathbb{Z}}_2$ gauge-Higgs model on a $3\times 3$ lattice, which is based on Trotter decomposition, the quantum adiabatic algorithm and its circuit realization. Then we perform a classical demonstration, dubbed a pseudoquantum simulation, on a GPU simulator. We obtain useful results on this model, which suggest the topological properties of the deconfined phase and help to clarify the phase diagram. It is suggested that the tricitical point, where the second-order critical lines of deconfinement-confinement transition and of deconfinement-Higgs transition meet, seems to be on the the first-order critical line of confinement-Higgs transition, at a point other than the end of this critical line.

   hep-latcond-mat.otherquant-phPRD(2022)·5 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.