Quantum creation and inflationary universes: A critical appraisal
Open accessAbstract
We contrast the possibility of inflation starting (a) from the universe's inception or (b) from an earlier noninflationary state. Neither case is ideal since (a) assumes that quantum mechanical reasoning is straightforwardly applicable to the early universe, while case (b) requires that a singularity still be present. Further, in agreement with Vachaspati and Trodden case (b) can only solve the horizon problem if the noninflationary phase has an equation of state $\ensuremath{\gamma}<4/3,$ thereby excluding radiation or massless scalar field dominated cases. Other alternative models, such as the smooth branch change in the pre-big-bang model, have related problems of requiring homogeneity over noncausally connected large scales.
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In a classical analysis, any upper bound in the potential can lead to ambiguous predictions from inflation: the flatness would still be arbitrary using a classical canonical measure because the kinetic energy can diverge.
“This is helpful since in a classical analysis it is known that any upper bound in the potential can lead to ambiguous predictions from inflation: the flatness would still be arbitrary [17-18] using a classical canonical measure [19]: essentially because the kinetic energy ˙ φ 2 can diverge.”
From Entropic Issues in Contemporary Cosmology (2003) · cites this paper as [19]
Cites
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Self-citationCanonical measure and the flatness of a FRW universe
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Entropic Issues in Contemporary Cosmology
COULE, D. H. (2003) · International Journal of Modern Physics D · doi:10.1142/s0218271803003530 · Cited by 6 · see citing works
Self-citation
- Authors
- Coule, D. H.
- Affiliations
- University of Portsmouth (GB)
- Corresponding author
- Coule, D. H.
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 2000-11-20
- Volume
- 62
- Issue
- 12
- ISSN
- 0556-2821 (ISSN-L)
- 1089-4918
- OpenAlex
- W2008056250
- Cited by
- 9
- References
- 8
- Citations by year
- 2013: 1
- FWCI
- 1.23
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Black Holes and Theoretical Physics
- Keywords
- quantum creation of the universe, cosmic inflation, horizon problem, singularities, equation of state, early universe
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