  When a brane and an anti-brane come close to each other, the tachyonic
potential between them increases and a tachyon wormhole is formed. This
configuration, which consists of two branes and a tachyonic wormhole, is called
a thermal tachyonic BIon. By considering the thermodynamic behaviour of this
system, one finds that its entropy has the same form as that of the Tsallis
one. By decreasing the separation between the branes, the tachyonic potential
increases, and the entropy grows.
