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In this paper, we explore means which can be used to change qualitatively thephase structure of charged black systems. For this, we consider a system ofblack D1/D5 (or its S-dual F/NS5). We find that the delocalized charged blackD-strings (F-strings) alone share the same phase structure as the charged blackD5 branes (NS5-branes), having no van der Waals-Maxwell liquid-gas type.However, when the two are combined to form D1/D5 (F/NS5), the resulting phasediagram has been changed dramatically to a richer one, containing now the aboveliquid-gas type. The effect of adding the charged D-strings (F-strings) on thephase structure can also be effectively described as a slight increase of thetransverse dimensions to the original D5 (NS5). This may be viewed as aconnection between a brane charge and a fraction of spatial dimension at leastin a thermodynamical sense.

The phase structure of black D1/D5 (F/NS5) system in canonical ensemble