Twisting type N vacuums with cosmological constant

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We provide the first examples of vacuum metrics with cosmological constant which have a twisting quadruple principal null direction.

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General Relativity and Quantum Cosmology

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http://salesiana.dossiersoluciones.com/handle/123456789/199545

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0710.5310
 http://arxiv.org/abs/0710.5310
 J.Geom.Phys.58:615-618,2008
 doi:10.1016/j.geomphys.2007.12.010

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arXiv