Finite-size condensate chemical potential
= Finite-size condensate chemical potential
For a noninteracting <ground state> of <energy> zero, $N_0=(e^{-\beta\mu}-1)^{-1}$ gives $\mu=-k_BT\ln(1+1/N_0)$. Thus a finite condensate has a slightly negative <chemical potential>; exact zero pinning is a macroscopic limiting statement.