String Cosmology backgrounds from Classical String Geometry. (arXiv:2005.08324v2 [hep-th] UPDATED)

<a href="http://arxiv.org/find/hep-th/1/au:+Bernardo_H/0/1/0/all/0/1">Heliudson Bernardo</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Brandenberger_R/0/1/0/all/0/1">Robert Brandenberger</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Franzmann_G/0/1/0/all/0/1">Guilherme Franzmann</a>

We introduce a very early universe model based on the thermodynamics of a gas

of closed strings in a background which is non-perturbative in $alpha’$. Upon

considering the fully $alpha’$-corrected equations extended to include certain

anisotropic cosmological backgrounds, we describe the evolution of the system

in three different stages parametrized by the gas’ equation of state. Using

standard string thermodynamical arguments, we start with an isotropic

10-dimensional universe inside the string scale and evolve it towards a

universe with four large spacetime dimensions and six stabilized internal

dimensions in the Einstein frame.

We introduce a very early universe model based on the thermodynamics of a gas

of closed strings in a background which is non-perturbative in $alpha’$. Upon

considering the fully $alpha’$-corrected equations extended to include certain

anisotropic cosmological backgrounds, we describe the evolution of the system

in three different stages parametrized by the gas’ equation of state. Using

standard string thermodynamical arguments, we start with an isotropic

10-dimensional universe inside the string scale and evolve it towards a

universe with four large spacetime dimensions and six stabilized internal

dimensions in the Einstein frame.

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