On the isotropy of the Universe: do Bianchi cosmologies isotropize?

@article{Wainwright1998OnTI,
  title={On the isotropy of the Universe: do Bianchi cosmologies isotropize?},
  author={J Wainwright and A A Coley and G F R Ellis and M Hancock},
  journal={Classical and Quantum Gravity},
  year={1998},
  volume={15},
  pages={331 - 350}
}
We study isotropization of the Universe by examining the evolution of a class of exact anisotropic cosmological solutions of Einstein's equations, namely spatially homogeneous cosmologies of Bianchi type with dust or radiation as the source. By using expansion-normalized variables, which unlike the usual metric variables are bounded throughout the evolution, we are able to give complete numerical simulations of the models, from the Planck time to the far-distant future. We find that two types…