Topological susceptibility at T>Tc from master-field simulations of the SU(3) gauge theory

The topological susceptibility is computed in the SU(3) gauge theory at temperatures T above the critical temperature Tc using master-field simulations of very large lattices, where the infamous topology-freezing issue is effectively bypassed. Up to T = 2.0 Tc no unusually large lattice effects are observed and the results obtained in the continuum limit confirm the expected rapid decay of the susceptibility with increasing temperature. As a byproduct, the reference gradient-flow time t0 is determined in the range of lattice spacings from 0.023 to 0.1 fm with a precision of 2 per mille.