The only requirement for an ensemble of particles to undergo a transition into a BEC is to be bosons.

But two fermions also make a bosons.

Are there physical, measureable implications of a BEC being made of fermionic particles? E.g. neutral atoms still being made of fermionic constituents?
Like, maybe there has to be a minimum size?
Could I tell a BEC of photons, of gravitons, of gluons, or of Higgs bosons, apart from one of bosonic atoms?

  • $\begingroup$ Constituents of complex bosons still obey the Pauli exclusion principle individually. $\endgroup$ – safesphere Jan 26 at 17:34
  • $\begingroup$ This question could IMO benefit from some editing and additional effort to refine it. There are obvious differences, such as mass. If you look at the WP article on BECs, there are observables there that depend on properties of the boson. Is this really what the question is about, or is the question really about statistics of composite particles? If the latter, then we've had a number of questions on that topic, e.g., physics.stackexchange.com/questions/455538/… and physics.stackexchange.com/questions/75403 . $\endgroup$ – Ben Crowell Jan 26 at 17:52

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