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Cited by 1,205Noncommutative and Quantum Gravity TheoriesCosmology and Gravitation TheoriesRelativity and Gravitational Theory

Loop quantum cosmology: a status report

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Ashtekar, Abhay, Singh, Parampreet·2011·Classical and Quantum Gravity
DOI 10.1088/0264-9381/28/21/213001
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  • The ratio of the fiducial bounce density to the Planck density is ρb/ρPl ∼ (E_b/M_Pl)^4 ∼ 10^-10, so the bounce lies comfortably below ρPl and in the same general regime usually assumed in semi-classical bounce scenarios such as loop quantum cosmology.

    “The ratio to the Planck density is ρ b ρ Pl ∼ E b M Pl 4 ∼ 10 -10 ,(44) so the bounce lies comfortably below ρ Pl and in the same general regime usually assumed in semi-classical bounce scenarios such as loop quantum cosmology [35].”

    From Dynamical systems analysis of an Einstein–Cartan ekpyrotic nonsingular bounce cosmology (2026) · cites this paper as [35]

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  • At the background level the bounce is a nonsingular ρ2-type bounce, similar in spirit to the effective Friedmann equation in loop quantum cosmology and to other torsion-based bouncing models.

    “At the background level this is a nonsingular ρ 2 -type bounce, similar in spirit to the effective Friedmann equation in loop quantum cosmology [35] and to other torsion-based bouncing models [22,29].”

    From Dynamical systems analysis of an Einstein–Cartan ekpyrotic nonsingular bounce cosmology (2026) · cites this paper as [35]

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200 of 268 shown

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Authors
Ashtekar, A., & Singh, P.
Affiliations
  • Pennsylvania State University (US)
  • Louisiana State University (US)
ORCID
Venue
Classical and Quantum Gravity
Publisher
IOP Publishing
Published
2011-09-20
Volume
28
Issue
21
Pages
213001
ISSN
  • 0264-9381 (ISSN-L)
  • 1361-6382
DOI
10.1088/0264-9381/28/21/213001
OpenAlex
W2064559964
Cited by
1,205
References
22
Citations by year
2026: 57 · 2025: 112 · 2024: 90 · 2023: 98 · 2022: 69 · 2021: 80 · 2020: 85 · 2019: 78 · 2018: 82 · 2017: 77 · 2016: 85 · 2015: 70 · 2014: 74 · 2013: 74 · 2012: 69
FWCI
54.35
Type
journal article
Language
en
Open access
Locations
  • Classical and Quantum Gravity (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Civil War Book Review (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (1068743, 0854743)
  • University of Pennsylvania
  • Pennsylvania State University
Topics
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Relativity and Gravitational Theory
Keywords
loop quantum cosmology, quantum cosmology, quantum gravity, cosmological models

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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

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