Speaker
Description
We discuss how to set the scale of finite-temperature lattice QCD via step-scaling. In practice, starting from a reference lattice with known scale, we want to tune the bare coupling and quark masses of a second lattice so that its lattice spacing is a chosen fraction of the reference one, while quark masses and temperature are fixed in physical units, up to lattice artifacts. This can be achieved using the gradient-flow renormalized coupling to tune the bare coupling, and mesonic screening masses to tune the bare quark masses. In particular, the ratio of lattice spacings can be set by rescaling the flow time as a function of the renormalized coupling for the two lattices. We test this method in the pure-gauge theory and present some preliminary results for QCD with dynamical fermions. The end goal is to use the resulting lines of constant physics for high-temperature determinations of the topological susceptibility.