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} }
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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References
SHOWING 1-4 OF 4 REFERENCES
Modern Cosmology
- Physics
- 2004
The last five years have seen the coming of age of Modern Cosmology, a mature branch of science based on the Big Bang theory and the Inflationary Paradigm. In particular, we can now define rather…
Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity
- Physics
- 1973
A leading physicist delves into relativity and experimental applications Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity offers a Nobel laureate's…
The classical theory of fields
- Physics, Geology
- 1952
The principle of relativity Relativistic mechanics Electromagnetic fields Electromagnetic waves The propagation of light The field of moving charges Radiation of electromagnetic waves Particle in a…