Extra dimensions and its segregation during evolution

TL;DR

This paper investigates how anisotropic energy-momentum tensors can cause extra dimensions to contract or expand differently over time, highlighting potential issues with such configurations.

Contribution

It introduces a model where anisotropic energy-momentum tensors lead to dynamical segregation of extra dimensions during evolution, challenging previous assumptions.

Findings

Extra dimensions can contract or expand anisotropically due to specific energy-momentum tensors.

Such configurations depend on initial conditions and may have problematic features.

The model raises questions about the physical viability of anisotropic extra-dimensional evolution.

Abstract

A special isotropic energy-momentum tensor causes an anisotropic dynamical segregation of contracting extra dimensions in contrast to expanding dimensions, provided initial data put different arrows of time evolution. Features of such the configuration are problematic and in question.