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We adopt in this work the idea that the building blocks of the visibleUniverse belong to a class of the irreducible representations of the Poincaregroup of transformations (the "things") endowed with classificatory quantumnumbers ("the properties"). After a discussion of this fundamentality, thequestion of the nature of both "dark" components of the Universe which aredeemed necessary, but have not been observed, is analyzed within this context.We broadly discuss the ontology of dark matter/dark energy in relation to theirreducible representations of the Poincar\'e group + quantum numbers, pointingout some cases in which the candidates can be associated to them, and othersfor which a reclassification of both the dark and visible (ordinary) componentswould be needed.

Which is the ontology of Dark Matter and Dark Energy?