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Why we consider identical particles like identical composite bosons for BEC. Why we do not consider non identical particles of differnt masses etc?

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  • $\begingroup$ Look up the definition of a thermodynamic ensemble. The usual framework for BEC theory is quantum statistics, where you CAN consider a mixture of different spices, but it won't bring in much new physics in play, while generating substantial analytical complications... $\endgroup$ – MsTais Nov 29 '18 at 19:48
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The irreducible representations of the Poincaré group are labelled by mass $m$ and the spin $s$.
So as soon you have particles that have different mass, they are intrinsically different and obey their own Bose/Fermi/... statistical distribution.

I assume here that you do not mean idential to be a synonym of indistinguishable. If yes, please clarify.

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  • $\begingroup$ Here we are taking identical and indistinguishable in a same meaning. $\endgroup$ – Tooba Dec 11 '18 at 5:51
  • $\begingroup$ Okay. Does the answer not satisfy you? $\endgroup$ – SuperCiocia Jan 20 at 22:33

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