Constraints from inflation on scalar-tensor gravity theories
Open accessAbstract
We show how observations of the perturbation spectra produced during inflation may be used to constrain the parameters of general scalar-tensor theories of gravity, which include both an inflaton and dilaton field. An interesting feature of these models is the possibility that the curvature perturbations on superhorizon scales may not be constant due to nonadiabatic perturbations of the two fields. Within a given model, the tilt and relative amplitude of the scalar and tensor perturbation spectra gives constraints on the parameters of the gravity theory, which may be comparable with those from primordial nucleosynthesis and post-Newtonian experiments. \textcopyright{} 1995 The American Physical Society.
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In the presence of multiple fields during inflation, the curvature perturbation ζ does not remain constant and varies because non-vanishing isocurvature perturbations act as a source term for the change of ζ.
“However, in the presence of multiple fields during the inflationary epoch, ζ does not remain constant and varies since the non-vanishing isocurvature perturbations act as a source term for the change of ζ [5,6].”
From Spectral running and non-Gaussianity from slow-roll inflation in generalized two-field models (2007) · cites this paper as [5]
The perturbed-field-equations section (p. 7) says entropy perturbations can cause ζ to evolve on super-Hubble scales in a two-field model. But it also says ζ remains constant for adiabatic modes, and the Conclusions (p. 15) identify two-field regimes where it remains constant. The claim overstates this possibility as an inevitable consequence of multiple fields. (LLM, conf=0.88)
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Cites
Formalizing the slow-roll approximation in inflation
Liddle, A. R., Parsons, P., & Barrow, J. D. (1994) · Physical Review D · doi:10.1103/physrevd.50.7222 · Cited by 714 · see citing works
Dark matter, time-varying<i>G</i>, and a dilaton field
Damour, T., Gibbons, G. W., & Gundlach, C. (1990) · Physical Review Letters · doi:10.1103/physrevlett.64.123 · Cited by 398 · see citing works
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Research works printed but not linked: 10
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Conditions for large non-Gaussianity in two-field slow-roll inflation
Byrnes, C. T., Choi, K.-Y., & Hall, L. M. H. (2008) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2008/10/008 · Cited by 143 · see citing works
Horizon Ratio Bound for Inflationary Fluctuations
Dodelson, S., & Hui, L. (2003) · Physical Review Letters · doi:10.1103/physrevlett.91.131301 · Cited by 134 · see citing works
Spectral running and non-Gaussianity from slow-roll inflation in generalized two-field models
Choi, K.-Y., Hall, L. M. H., & Bruck, C. V. D. (2007) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2007/02/029 · Cited by 98 · see citing works
- Authors
- García-Bellido, J., & Wands, D.
- Affiliations
- University of Sussex (GB)
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 1995-12-15
- Volume
- 52
- Issue
- 12
- Pages
- 6739-6749
- ISSN
- 0556-2821 (ISSN-L)
- OpenAlex
- W2093104970
- Cited by
- 133
- References
- 2
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 4 · 2019: 4 · 2018: 4 · 2017: 5 · 2016: 9 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 4
- FWCI
- 6.88
- 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)
- PubMed (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
- scalar-tensor gravity, inflation (cosmology), dilaton, inflaton, curvature perturbations, spectral tilt, parameter constraints, big bang nucleosynthesis, post-Newtonian tests
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