The DOI matches its Crossref record; 56 of the 56 references it cites were found in a registry or an index.
Ekpyrotic loop quantum cosmology
Open accessAbstract
We consider the ekpyrotic paradigm in the context of loop quantum cosmology. In loop quantum cosmology the classical big-bang singularity is resolved due to quantum gravity effects, and so the contracting ekpyrotic branch of the universe and its later expanding phase are connected by a smooth bounce. Thus, it is possible to explicitly determine the evolution of scalar perturbations, from the contracting ekpyrotic phase through the bounce and to the post-bounce expanding epoch. The possibilities of having either one or two scalar fields have been suggested for the ekpyrotic universe, and both cases will be considered here. In the case of a single scalar field, the constant mode of the curvature perturbations after the bounce is found to have a blue spectrum. On the other hand, for the two scalar field ekpyrotic model where scale-invariant entropy perturbations source additional terms in the curvature perturbations, the power spectrum in the post-bounce expanding cosmology is shown to be nearly scale-invariant and so agrees with observations.
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“Numerical solutions of the modified Friedmann system with an imprint field recover these integer cycle counts and the associated proper-time integrals, validating the chronometer scheme against loop-quantum-cosmology bounce benchmarks [32,33,34,35,36].”
From Counting Cosmic Cycles: Past Big Crunches, Future Recurrence Limits, and the Age of the Quantum Memory Matrix Universe (2025) · cites this paper as [34]
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Cites
Theory of cosmological perturbations
Mukhanov, V (1992) · Physics Reports · doi:10.1016/0370-1573(92)90044-z · Cited by 3,608
Physical Foundations of Cosmology
Mukhanov, V. (2005) · doi:10.1017/cbo9780511790553 · Cited by 2,316
Ekpyrotic universe: Colliding branes and the origin of the hot big bang
Khoury, J., Ovrut, B. A., Steinhardt, P. J., & Turok, N. (2001) · Physical Review D · doi:10.1103/physrevd.64.123522 · Cited by 1,549
Loop quantum cosmology: a status report
Ashtekar, A., & Singh, P. (2011) · Classical and Quantum Gravity · doi:10.1088/0264-9381/28/21/213001 · Cited by 1,205
Quantum nature of the big bang: Improved dynamics
Ashtekar, A., Pawlowski, T., & Singh, P. (2006) · Physical Review D · doi:10.1103/physrevd.74.084003 · Cited by 1,147 · cited 2×
“What is more is that states that are initially sharply peaked remain sharply peaked throughout their evolution [24].”
BackgroundNew approach to the evolution of cosmological perturbations on large scales
Wands, D., Malik, K. A., Lyth, D. H., & Liddle, A. R. (2000) · Physical Review D · doi:10.1103/physrevd.62.043527 · Cited by 862
Adiabatic and entropy perturbations from inflation
Gordon, C., Wands, D., Bassett, B. A., & Maartens, R. (2000) · Physical Review D · doi:10.1103/physrevd.63.023506 · Cited by 727
Khoury, J., Ovrut, B. A., Seiberg, N., Steinhardt, P. J., & Turok, N. (2002) · Physical Review D · doi:10.1103/physrevd.65.086007 · Cited by 635
BOJOWALD, M. (2005) · 100 Years of Relativity · doi:10.1142/9789812700988_0014 · Cited by 542
Robustness of key features of loop quantum cosmology
Ashtekar, A., Corichi, A., & Singh, P. (2008) · Physical Review D · doi:10.1103/physrevd.77.024046 · Cited by 460
Research works printed but not linked: 1
- 10.12942/lrr-2008-4 · doi:10.12942/lrr-2008-4 · Paper page
Cited by
Neukart, F., Marx, E., & Vinokur, V. (2025) · Entropy · doi:10.3390/e27101043 · Cited by 4
Metadata
- Authors
- Wilson-Ewing, E.
- Affiliations
- Louisiana State University (US)
- Corresponding author
- Wilson-Ewing, Edward
- ORCID
- Wilson-Ewing, Edward
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2013-08-08
- Volume
- 2013
- Issue
- 08
- Pages
- 015-015
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2033389363
- Cited by
- 33
- References
- 56
- Citations by year
- 2025: 3 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 2 · 2018: 3 · 2017: 4 · 2016: 6 · 2015: 5 · 2014: 4
- FWCI
- 2.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- iopscience.iop.org/info/page/text-and-data-mining (tdm)
- iopscience.iop.org/page/copyright (vor)
- Locations
- Journal of Cosmology and Astroparticle Physics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- John Templeton Foundation
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Noncommutative and Quantum Gravity Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Black Holes and Theoretical Physics
- Keywords
- ekpyrotic cosmology, loop quantum cosmology, bounce cosmology, Big Bang singularity resolution, scalar perturbations, curvature perturbations, blue spectrum, entropy perturbations, scale-invariant spectrum, two-scalar-field model, quantum gravity
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- Wilson-Ewing, E. (2013). Ekpyrotic loop quantum cosmology. Journal of Cosmology and Astroparticle Physics. https://doi.org/10.1088/1475-7516/2013/08/015
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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