The 34th International Symposium on Lattice Field Theory (Lattice 2016)

Session

Chiral Symmetry

25 Jul 2016, 14:15

Highfield Campus, University of Southampton

Conveners

Chiral Symmetry

• Andreas Athenodorou (University of Cyprus)

Chiral Symmetry

• Stephan Durr (University of Wuppertal)

64. First Experiences with Overlap Fermions based on the Brillouin Kernel

Dr Stephan Durr (University of Wuppertal)

25/07/2016, 14:15

Chiral Symmetry

Talk

First experiences are reported with overlap fermions which employ the Brillouin action as a kernel. After discussing the dispersion relations of both the kernel and the resulting chiral action, some of the physics features are addressed on quenched backgrounds. We find that the overlap with Brillouin kernel is much better localized than the overlap with Wilson kernel. Also a preliminary...

158. QCD with Flavored Minimally Doubled Fermions

Dr Johannes Heinrich Weber (Technische Universität München)

25/07/2016, 14:35

Chiral Symmetry

Talk

I discuss QCD with Flavored Minimally Doubled Fermions as sea quarks. Minimally Doubled Fermions are an ultra-local formulation that realizes a non-singlet chiral symmetry with only two real fermions at finite lattice cutoff, but break the hypercubic symmetry as well as some discrete space-time symmetries. I show that the broken discrete space-time symmetries do not affect vacuum since the...

219. Chiral condensate from OPE of the overlap quark propagator

Zhaofeng LIU (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing)

25/07/2016, 14:55

Chiral Symmetry

Talk

Using 2+1-flavor domain wall fermion configurations, we calculate the overlap quark propagator in the Landau gauge. Then we try to extract the chiral condensate from the operator product expansion of the quark propagator in momentum space.

327. Determination of chiral condensate from low-lying eigenmodes of Mobius domain-wall Dirac operator

Dr Shoji Hashimoto (KEK)

25/07/2016, 15:15

Chiral Symmetry

Talk

We calculate the spectral function of the Mobius domain-wall Dirac operator utilizing a stochastic eigenvalue counting technique. From the low-end of the spectrum we extract the chiral condensate in 2+1-flavor QCD, and take the chiral and continuum limits. Lattice ensembles are those generated with Mobius domain-wall fermions at a~0.080, 0.055 and 0.044 fm.

283. Staggered domain wall fermions

Dr Christian Hoelbling (Wuppertal University)

25/07/2016, 15:35

Chiral Symmetry

Talk

We construct domain wall fermion operators with a staggered kernel and investigate their spectral and chiral properties numerically in the Schwinger model. In some relevant cases we see an improvement of chirality by more than an order of magnitude compared to standard domain wall fermions.

332. Comparing different definitions of the topological charge

Dr Andreas Athenodorou (University of Cyprus)

27/07/2016, 11:30

Chiral Symmetry

Talk

We perform a numerical comparison of different lattice definitions of the topological charge by investigating the correlation coefficient between different definitions as well as the topological susceptibility. We use small-volume ensembles with 2 flavours of dynamical twisted mass fermions. We investigate the following definitions of the topological charge: index of the overlap Dirac...

244. $\theta$-dependence of the massive Schwinger model

Eduardo Royo (Universidad de Zaragoza)

27/07/2016, 11:50

Chiral Symmetry

Talk

Understanding the role of the $\theta$ parameter in QCD and its connection with the strong CP problem and axion physics is one of the major challenges for high energy theorists. Due to the sign problem, at present only the QCD topological susceptibility is well known. Using an algorithmic approach that could potentially be extended to QCD, we study as a first step the $\theta$-dependence...

271. Real-time simulations of anomaly induced transport in external magnetic field

Mr Senia Valgushev (Regensburg University)

27/07/2016, 12:10

Chiral Symmetry

Talk

One of the macroscopic manifestations of the Chiral anomaly in a matter with Dirac fermions is a large negative magnetoresistivity in strong magnetic fields, which is common feature of Weyl- and Dirac semimetals and QCD. However, most of previous studies have been done in the linear response approach in non-interacting theory. We study Magnetoresistivity in a model of Dirac semimetal using...