Cosmological expansion and local physics

The interplay between cosmological expansion and local attraction in a gravitationally bound system is revisited in various regimes. First, weakly gravitating Newtonian systems are considered, followed by various exact solutions describing a relativistic central object embedded in a Friedmann univer...

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Bibliographic Details
Published in:arXiv.org 2007-07
Main Authors: Faraoni, Valerio, Jacques, Audrey
Format: Article
Language:English
Subjects:
Censorship
Exact solutions
Mathematical analysis
Universe
Online Access:Get full text
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Summary:The interplay between cosmological expansion and local attraction in a gravitationally bound system is revisited in various regimes. First, weakly gravitating Newtonian systems are considered, followed by various exact solutions describing a relativistic central object embedded in a Friedmann universe. It is shown that the ``all or nothing'' behaviour recently discovered (i.e., weakly coupled systems are comoving while strongly coupled ones resist the cosmic expansion) is limited to the de Sitter background. New exact solutions are presented which describe black holes perfectly comoving with a generic Friedmann universe. The possibility of violating cosmic censorship for a black hole approaching the Big Rip is also discussed.
ISSN:2331-8422
DOI:10.48550/arxiv.0707.1350