  We simulate dynamic mechanical analysis experiments for the Kob-Andersen
binary Lennard-Jones system. For this, the SLLOD algorithm with time-dependent
strain rates is applied to give a sinusoidally varying strain at different
densities and temperatures. The starting point is a temperature scan at a fixed
reference density. Isomorph theory predicts that for other densities
corresponding temperatures can be identified at which the mechanical properties
are unchanged when scaled appropriately. We determine the isomorphically
equivalent temperatures by analysing how particle forces change upon scaling
configurations to the new density. Loss moduli expressed in suitable reduced
units are compared for isomorphic state points. When plotted against the
unscaled temperatures, these reduced loss curves are observed to collapse
indicating the validity of isomorph theory for dynamic mechanical analysis
experiments. Two different methods to determine isomorphic temperatures are
considered. While one of them breaks down for the largest density rescalings
considered in this study, the other one is still applicable in this region. The
decorrelation of force vectors upon rescaling is investigated as a possible
origin of this effect. Our results demonstrate that the simplification of the
phase diagram entailed by isomorph theory for a wide class of system is
relevant also for the mechanical properties of glasses.
