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Primordial perturbations in a nonsingular bouncing universe model
Open accessAbstract
We construct a simple nonsingular cosmological model in which the currently observed expansion phase was preceded by a contraction. This is achieved, in the framework of pure general relativity, by means of a radiation fluid and a free scalar field having negative energy. We calculate the power spectrum of the scalar perturbations that are produced in such a bouncing model under the assumption of initial vacuum state for the quantum field associated with the hydrodynamical perturbation. The matching conditions applying to this bouncing model are derived and shown to be different from those in the case of a sharp transition. We show that if our bounce transition is smoothly connected to a slowly contracting phase, this provides a new way to generate a scale invariant power spectrum.
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Cites
The Large Scale Structure of Space-Time
Hawking, S. W., & Ellis, G. F. R. (1973) · doi:10.1017/cbo9780511524646 · Cited by 10,624
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Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking
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Cited by
Modified gravity theories on a nutshell: Inflation, bounce and late-time evolution
Nojiri, S., Odintsov, S. D., & Oikonomou, V. K. (2017) · Physics Reports · doi:10.1016/j.physrep.2017.06.001 · Cited by 2,734
The pre-big bang scenario in string cosmology
Gasperini, M., & Veneziano, G. (2003) · Physics Reports · doi:10.1016/s0370-1573(02)00389-7 · Cited by 872
Qiu, T., Evslin, J., Cai, Y.-F., Li, M., & Zhang, X. (2011) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2011/10/036 · Cited by 206
Bouncing cosmologies in modified gravity with spacetime torsion
Alam, S., Sen, S., & Sengupta, S. (2025) · The European Physical Journal C · doi:10.1140/epjc/s10052-025-15123-8
Metadata
- Authors
- Peter, P., & Pinto-Neto, N.
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 2002-09-25
- Volume
- 66
- Issue
- 6
- ISSN
- 0556-2821 (ISSN-L)
- 1089-4918
- OpenAlex
- W2156815396
- Cited by
- 169
- References
- 5
- FWCI
- 8.25
- Type
- journal article
- Language
- en
- Open access
- green
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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