  We modify the usual definitions of cumulants of net-charge fluctuations in a
way that isolates dynamical fluctuations. The new observables, which we call
dynamical cumulants, are robust with respect to trivial correlations induced by
volume fluctuations and global charge conservation. We illustrate the potential
of dynamical cumulants by carrying out Monte Carlo simulations where all
correlations are trivial. The results of our simulations agree well with
Relativistic Heavy Ion Collider (RHIC) data, and are used to illustrate that
dynamical cumulants consistently isolate dynamical fluctuations.
