Topological susceptibility at $T>T_{\rm c}$ from master-field simulations of the SU(3) gauge theory

The topological susceptibility is computed in the $\mathrm{SU(3)}$ gauge theory at temperatures T above the critical temperature $T_{\mathrm{c}}$ using master-field simulations of very large lattices, where the infamous topology-freezing issue is effectively bypassed. Up to $T=2.0\,T_{\mathrm{c}}$ 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 $t_0$ is determined in the range of lattice spacings from 0.023 to $0.1\,\mathrm{fm}$ with a precision of 2 per mille.