We already have the primary observables InternalEnergyDensity $=\langle U \rangle$ and InternalEnergyDensitySquared = $=\langle U^2 \rangle$, so we should be able to get a derived quantity like $\langle U^2 \rangle - \langle U \rangle^2$. What is a good name? InternalEnergyDensityFluctuations or something like that?
We already have the primary observables
InternalEnergyDensity
$=\langle U \rangle$ andInternalEnergyDensitySquared
= $=\langle U^2 \rangle$, so we should be able to get a derived quantity like $\langle U^2 \rangle - \langle U \rangle^2$. What is a good name?InternalEnergyDensityFluctuations
or something like that?