Non-perturbative renormalization constants for gluonic and fermionic components of the traceless energy-momentum tensor in Nf=3 lattice QCD are computed to few-percent accuracy using discretized Ward identities with shifted boundary conditions.
Renormalization constants of the lattice energy momentum tensor using the gradient flow
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abstract
We employ a new strategy for a non perturbative determination of the renormalized energy momentum tensor. The strategy is based on the definition of suitable lattice Ward identities probed by observables computed along the gradient flow. The new set of identities exhibits many interesting qualities, arising from the UV finiteness of flowed composite operators. In this paper we show how this method can be used to non perturbatively renormalize the energy momentum tensor for a SU(3) Yang-Mills theory, and report our numerical results.
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The QCD energy-momentum tensor on the lattice: non-perturbative renormalization with $N_f=3$
Non-perturbative renormalization constants for gluonic and fermionic components of the traceless energy-momentum tensor in Nf=3 lattice QCD are computed to few-percent accuracy using discretized Ward identities with shifted boundary conditions.