Equilibrium Statistical Operator for Grand Canonical Ensemble

Petar Mali
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Canonical ensemble

equilibrium average value

\left\langle...\right\rangle_0=Q^{-1}Tr(e^{-\beta \hat{H}_0}...)

\hat{\rho}_0=Q^{-1}e^{-\beta \hat{H}_0}

Grand canonical ensemble

\left\langle...\right\rangle_0=Q^{-1}Tr(e^{-\beta (\hat{H}_0-\mu\hat{N})}...)

for example let's say

\hat{\mathcal{H}}_0=\hat{H}_0-\mu\hat{N}

Can I say that the equilibrium statistical operator

\hat{\rho}_0=Q^{-1}e^{-\beta (\hat{H}_0-\mu\hat{N})}=Q^{-1}e^{-\beta \hat{\mathcal{H}}_0 }
 
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Generally my question is about this ''0'' terms. Do I need to write this?
 
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