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We study the flux tube thickness of a generic Lattice Gauge Theory near thedeconfining phase transition. It is well known that the effective string modelpredicts a logarithmic increase of the flux tube thickness as a function of theinterquark distance for any confining LGT at zero temperature. It is perhapsless known that this same model predicts a linear increase in the vicinity ofthe deconfinement transition. We present a precise derivation of this resultand compare it with a set of high precision simulations in the case of the 3dgauge Ising model.

On the linear increase of the flux tube thickness near the deconfinement transition