• Corpus ID: 208512959

Homogeneity and the causal boundary

@article{Gaztaaga2019HomogeneityAT,
  title={Homogeneity and the causal boundary},
  author={Enrique Gazta{\~n}aga},
  journal={arXiv: General Relativity and Quantum Cosmology},
  year={2019}
}
  • E. Gaztañaga
  • Published 26 November 2019
  • Physics
  • arXiv: General Relativity and Quantum Cosmology
A Universe with finite age also has a finite causal scale $\chi_\S$, so the metric can not be homogeneous for $\chi>\chi_\S$, as it is usually assumed. To account for this, we propose a new causal boundary condition, that can be fulfil by fixing the cosmological constant $\Lambda$ (a free parameter for gravity). The resulting Universe is inhomogeneous, with possible variation of cosmological parameters on scales $\chi \simeq \chi_\S$. The size of $\chi_\S$ depends on the details of inflation… 
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