13 papers
The perturbative Ricci flow in gravity
Robert V. Harlander, Yannick Kluth, Jonas T. Kohnen +1
We develop a perturbative formulation of the Ricci flow in gravity. Following steps analogous to the gradient flow in QCD, we supplement the usual Feynman rules for perturbative gr…
Heavy-Meson Bag Parameters using Gradient Flow
Matthew Black, Robert V. Harlander, Jonas T. Kohnen +4
We demonstrate the use of the gradient flow combined with the short flow-time expansion (GF+SFTX) as a renormalization procedure for four-quark operator matrix elements and associa…
Bag Parameters for Heavy Meson Lifetimes
Matthew Black, Robert V. Harlander, Jonas T. Kohnen +4
We calculate the dimension-six four-quark matrix elements describing heavy-meson lifetime ratios using the gradient flow with its short flow-time expansion as a renormaliza…
Renormalized quark masses using gradient flow
Matthew Black, Robert V. Harlander, Anna Hasenfratz +2
We propose a new and simple method for determining the renormalized quark masses from lattice simulations. Renormalized quark masses are an important input to many phenomenological…
The gradient-flow coupling of three-and four-dimensional QED
Lars Georg, Robert V. Harlander, Robert H. Mason
We evaluate the QED coupling in the gradient-flow scheme in three and four space-time dimensions. Our general result applies to any theory with a U(1) gauge field coupled to arbita…
Quark-mass effects in gradient-flow observables through next-to-next-to-leading order in QCD
Robert V. Harlander, Robert H. Mason
We provide results for the vacuum expectation values of the flowed action density, the quark condensate, and the quark kinetic operator in the gradient-flow formalism. We work in $…