  We consider a compactification with a six-dimensional torus in the type II
brane gas models. We show that the dilaton and the scale of each cycle of the
internal space are fixed in the presence of NS5-brane and Kaluza-Klein
monopoles as well as D-branes with the gauge fields. We can construct various
models that lead to fixed moduli by using T-duality transformations.

High Energy Physics - Theory;Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Phenomenology