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Let say we consider a $N$ pair of elementry bosons (i.e $N$ composite bosons). At very low temperature these bosons will condense into the ground state. If we find the mean occupation number $\langle n\rangle$ for a ground state sometime we get $\langle n\rangle$ greater then total number of composite bosons N. This is because constituent bosons are showing their bosonic nature individually. I need more explanation about this kind of bunching.

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  • $\begingroup$ First of all the condensation depends on the dimensionality of the system. Second could you point to a reference which lays out the context? E.g. the formula you use to get $\langle n \rangle$? $\endgroup$ – SuperCiocia Jan 23 at 19:47

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