String cosmology backgrounds from classical string geometry

We introduce a very early universe model based on the thermodynamics of gas closed strings in background that is nonperturbative ${\ensuremath{\alpha}}^{\ensuremath{'}}$. Upon considering fully ${\ensuremath{\alpha}}^{\ensuremath{'}}$-corrected equations extended to include certain anisotropic cosmological backgrounds, we describe evolution system three different stages parametrized by gas's equation state. Using standard string thermodynamical arguments, start with an isotropic ten-dimensional inside scale and evolve it toward four large spacetime dimensions six stabilized internal Einstein frame.