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I am wondering why BE gas ground state contribute no energy.if so, then dose it mean that if we drive the Bose gas to absolute zero,then it doesn't own any energy?

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It means that all atoms are in the ground state, then since potential energy is defined up to a constant you can say ground state has zero energy

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  • $\begingroup$ What is interesting is to compare to fermions : 2 fermions cannot be in the same state, so if you cool down a fermion gas you will fill states from the ground one to the Nth one (if you have N atoms) $\endgroup$ – agemO Jun 11 '15 at 9:20

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