Lattice2010

Session

Parallel 59: Theoretical developments

18 Jun 2010, 14:30

Villasimius, Sardinia

19. Towards step-scaling with off-shell renormalisation

Rudy Arthur (University of Edinburgh)

18/06/2010, 14:30

Theoretical developments

We apply twisted boundary conditions to off-shell Rome-Southampton non-perturbative renormalisation. This enables us to select momenta that are not necessarily a Fourier mode. The technique allows better controlled continuum extrapolation of results by removing O(4) breaking ambiguity. Continuity of the momentum scale allows us to develop a step-scaling technique that does not require...

206. Testing universality and automatic O(a) improvement in massless lattice QCD with Wilson quarks

Stefan Sint (Trinity College Dublin)

18/06/2010, 14:50

Theoretical developments

The chirally rotated Schroedinger functional (SF) provides a test bed for universality and automatic O(a) improvement. In joint work with Bjoern Leder, we have implemented the chirally rotated Schroedinger functional and carried out extensive quenched simulations. We demonstrate that, after proper tuning of a dimension 3 boundary counterterm, the expected chirally rotated SF boundary...

32. Transfer Matrix for Partially Quenched QCD

Maarten Golterman (San Francisco State University)

18/06/2010, 15:10

Theoretical developments

Partially quenched lattice QCD is defined in euclidean space, and usually considered not be unitary. This raises the question whether effective field theory methods, such as chiral perturbation theory, can be justified in the partially quenched case. In this talk, we take a first step, in which we construct a transfer matrix for the ghost sector of partially quenched theories. While...

252. Reflection positivity of the free overlap fermions.

Kouta Usui (University of Tokyo)

18/06/2010, 15:30

Theoretical developments

We rigorously show that free overlap Dirac fermions on lattice satisfies the Osterwalder Schrader reflection positivity condition, which leads to the unitarity property of the corresponding quantum theory.

21. Classification and Generalization of Minimal-doubling actions

Tatsuhiro MISUMI (Yukawa Institute for Theoretical Physics, Brookhaven National Laboratory)

18/06/2010, 15:50

Theoretical developments

There is a chance that Minimal-doubling fermion actions will remove a numerical expense in Lattice QCD simulations although all the known examples so far lack sufficient discrete symmetries for a good continuum limit. In this talk we discuss classification and unification of Minimal-doubling actions to search for possibiliy of their application. In this context we propose a new class of...