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We show that several features (the three-dimensional XY universality formoderate underdoping, the almost-BCS behaviour for moderate overdoping and thecritical exponent) of the superfluid density in hole-doped cuprates hint at acomposite structure of the holes. This idea can be implemented in a spin-chargegauge approach to the $t - t' - J$ model and provides indeed good agreementwith available experimental data.

Superfluid density in cuprates: hints on gauge compositeness of the holes