Novel Lattice Fermions and their Suitability for High-Performance Computing and Perturbation Theory

6 Mar 2023, 09:00 → 10 Mar 2023, 17:30 Europe/Berlin

02.430 (Mainz Institute for Theoretical Physics, Johannes Gutenberg University)

Calculations in Lattice QCD would traditionally use Wilson fermions or staggered fermions or one of the (closely related) overlap or domain-wall formulations.
More recently, a number of novel fermion actions has been proposed, including Karsten-Wilczek and Borici-Creutz fermions, but also Adams fermions, Brillouin fermions and central-branch fermions belong to this category. The lattice community is in the process of assessing strengths and weaknesses of these new formulations relative to the established ones.

The goal of this workshop is to bring scientists covering formal aspects of lattice field theory together with experts in high-performance computing and perturbative calculations with a Lorentz-symmetry breaking regulator, in order to foster the exchange of ideas and help the community focus on those action design choices which augur well in all relevant aspects – physics properties, computational speed and suitability for perturbative calculations needed to design efficient interpolating operators.

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Monday 6 March

Registration and assignment of office spaces

1 Welcome

2 The theta-parameter with minimal doubling

Speaker: Mike Creutz

etamin.pdf

11:30 Coffee break

3 Topology awareness of undoubled and doubled lattice fermions

Speaker: Stephan Dürr

durr_mitp23_topology.pdf

13:00 Lunch break

4 New insights into lattice fermions and topology

Speaker: Tatsuhiro Misumi

MITP030623_compressed.pdf

15:00 Coffee break

5 Topological aspects of fermions on a honeycomb lattice

Speaker: Simon Hands

hands_honeycomb.pdf

Novel fermions and topology: Discussion

Tuesday 7 March

6 Overview of Adams fermions

Speaker: Christian Hoelbling

hoelbling_novel2023.pdf

7 Problems with staggered rooting at finite chemical potential

Speaker: Attila Pásztor

11:30 Coffee break

8 Lattice fermions based on graph theory and a new conjecture about species doubling

Speaker: Jun Yumoto

slide_at_MITP.pdf

13:00 Lunch break

9 Exact lattice anomalies and a possible path to lattice chiral gauge theories

Speaker: Simon Catterall

mainz.pdf

15:00 Coffee break

10 GPU implementations of fermion actions in SIMULATeQCD

Speaker: Christian Schmidt

Schmidt_SIMULATeQCD.pdf

Implementation and HPC needs of novel lattice fermions: Discussion

Wednesday 8 March

11 Computation of $c_{SW}$ at 1-loop for Brillouin fermions

Speaker: Max Ammer

ammer_NOVEL2023.pdf

12 Renormalization of Karsten-Wilczek and Borici-Creutz fermions

Speaker: Stefano Capitani

mdf1.pdf

11:30 Coffee break

13 Automated Perturbation theory for staggered and minimally doubled fermions

Speaker: Georg von Hippel (JGU Mainz)

talk.pdf

13:00 Lunch break

14 Generalized Karsten-Wilczek and Borici-Creutz actions and the removal of the counterterms

Speaker: Stefano Capitani

mdf1.pdf

15:00 Coffee break

15 Numerical simulations with KW fermions

Speaker: Johannes Weber

Numerical Studies With Karsten-Wilczek Fermions.pdf

Perturbation theory: Discussion

19:00 Social dinner

Thursday 9 March

16 Restoration of hypercubic symmetry with Borici-Creutz fermions

Speaker: Rudina Osmanaj-Zeqirllari

Novel2023_Mainz_Osmanaj.pdf

17 Implications of taste structure for minimally doubled fermions

Speaker: Johannes Weber

Implications Of Taste Structure Of Minimally Doubled Fermions.pdf

11:30 Coffee break

18 Staggered anomalous transport

Speaker: Gergely Endrődi

endrodi-novel2023.pdf

Are there minimally-doubled staggered fermions?

QCDNA10.pdf

13:00 Lunch break

19 Experiences with Karsten-Wilczek solvers

Speakers: Chik Him Wong, Szabolcs Borsanyi

wong-mainz23.pdf

20 Experiences with solvers for BC fermions

Speaker: Rudina Osmanaj-Zeqirllari

Osmanaj__BC_Experiences.pdf

15:00 Coffee break

Spectroscopy and tuning issues in dynamical simulations

Friday 10 March

21 Overview of Brillouin fermions

Speaker: Giannis Koutsou

koutsou-NOVEL23.pdf

22 Benefits of overlap-hypercube fermions: chirality, improved locality and scaling

Speaker: Wolfgang Bietenholz

overlapHF4.pdf

11:30 Coffee break

23 Hadrons, Superconductor Vortices, and Cosmological Constant

Speaker: Keh-Fei Liu

HSC_Mainz-Marseille,Regensburg.pdf

13:00 Lunch break

24 Free-field dispersion relations as a guide to heavy-quark physics

Speaker: Stephan Durr

durr_mitp23_dispersion.pdf

14:30 Coffee break

Physics prospects: Discussion

25 Closing