Cosmology with two compactification scales

TL;DR

This paper explores a higher-dimensional cosmological model with two different compactification scales, analyzing how the universe's structure and evolution are affected by these scales.

Contribution

It introduces a model with two distinct compactification scales in higher-dimensional spacetime, providing new insights into their cosmological implications.

Findings

Different compactification scales influence the universe's evolution.

The model bridges large-scale cosmology and Planck-scale physics.

Potential implications for string theory and extra dimensions.

Abstract

We consider a (4+d)-dimensional spacetime broken up into a (4-n)-dimensional Minkowski spacetime (where n goes from 1 to 3) and a compact (n+d)-dimensional manifold. At the present time the n compactification radii are of the order of the Universe size, while the other d compactification radii are of the order of the Planck length.