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The Story of Collapsing StarsBlack Holes, Naked Singularities, and the Cosmic Play of Quantum Gravity$
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Pankaj S. Joshi

Print publication date: 2015

Print ISBN-13: 9780199686766

Published to Oxford Scholarship Online: January 2015

DOI: 10.1093/acprof:oso/9780199686766.001.0001

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(p.61) 4 Singularities
The Story of Collapsing Stars

Pankaj S. Joshi

Oxford University Press

This chapter narrates the history of the furious debate that took place over the existence of spacetime singularities. After describing what a spacetime singularity is and pointing out its existence, we consider various options as to whether we can avoid such singularities. It is concluded that under a wide set of physically reasonable conditions, general relativity necessarily implies the occurrence of spacetime singularities when massive stars collapse in the Universe, and in cosmology at the origin of the Universe, otherwise known as the Big Bang. The chapter considers the issues of causality violations, energy conditions, and also the formation of trapped surfaces, which play key role in the occurrence of singularities. The basic physical challenges posed by spacetime singularities are narrated.

Keywords:   spacetime singularity, energy conditions, causality violations, singularity theorems, Big Bang

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