On Penrose's `before the big bang' ideas

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We point out that algebraically special Einstein fields with twisting rays exhibit the basic properties of conformal Universes considered recently by Roger Penrose.
We changed our conventions, so that the sign of the cosmological constant agrees with the conventions of cosmologists

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General Relativity and Quantum Cosmology, Differential Geometry

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http://salesiana.dossiersoluciones.com/handle/123456789/140461

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0710.3879
 http://arxiv.org/abs/0710.3879

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arXiv