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Is the universe infinitely old?

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Publication Date
Identifiers
DOI: 10.1088/0264-9381/7/10/015
OAI: oai:inspirehep.net:305029
Source
INSPIRE-HEP
Keywords
  • Astrophysics
  • Gravitation And Cosmology
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Abstract

The Hartle-Hawking no-boundary proposal (1983) for the wavefunction of the Universe suggests, via a minisuperspace calculation, that the Universe may have had an infinite period of inflation. If the classical spacetime is said to have an edge or singularity where the semiclassical approximation breaks down, that would be at an infinite amount of comoving time in the past, though at only a finite proper time for geodesics with non-zero momentum, so the spacetime would still be singular even if infinitely old.

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