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Primordial power spectra from anisotropic inflation
Open accessAbstract
We examine cosmological perturbations in a dynamical theory of inflation in which an Abelian gauge field couples directly to the inflaton, breaking conformal invariance. When the coupling between the gauge field and the inflaton takes a specific form, inflation becomes anisotropic and anisotropy can persist throughout inflation, avoiding Wald's no-hair theorem. After discussing scenarios in which anisotropy can persist during inflation, we calculate the dominant effects of a small persistent anisotropy on the primordial gravitational wave and curvature perturbation power spectra using the ``in-in'' formalism of perturbation theory. We find that the primordial power spectra of cosmological perturbations gain significant direction dependence and that the fractional direction dependence of the tensor power spectrum is suppressed in comparison to that of the scalar power spectrum.
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“the last inequality follows from the observational limit Ω 0 curv ≤ 6.6 × 10 -3 (WMAP+BAO+SN with w = -1 prior, treating the 95% confidence level as if it were a hard bound) [40]”
From Observable effects of anisotropic bubble nucleation (2010) · cites this paper as [40]
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Wald, R. M. (1983) · Physical Review D · doi:10.1103/physrevd.28.2118 · Cited by 838
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Observable effects of anisotropic bubble nucleation
Blanco-Pillado, J. J., & Salem, M. P. (2010) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2010/07/007 · Cited by 44
Metadata
- Authors
- Dulaney, T. R., & Gresham, M. I.
- Affiliations
- California Institute of Technology (US)
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 2010-05-26
- Volume
- 81
- Issue
- 10
- ISSN
- 0556-2821 (ISSN-L)
- 1550-7998
- 1550-2368
- OpenAlex
- W2092167610
- Cited by
- 140
- References
- 1
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 4 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 5 · 2019: 3 · 2018: 6 · 2017: 3 · 2016: 11 · 2015: 15 · 2014: 14 · 2013: 19 · 2012: 17
- FWCI
- 7.59
- 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)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- arXiv (Cornell University)
- 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
- anisotropic inflation, primordial power spectrum, Abelian gauge fields, inflaton coupling, conformal invariance breaking, no-hair theorem, primordial gravitational waves, curvature perturbations, tensor power spectrum, scalar power spectrum, orientation dependence, in-in formalism, cosmological perturbations
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- Dulaney, T. R., & Gresham, M. I. (2010). Primordial power spectra from anisotropic inflation. Physical Review D. https://doi.org/10.1103/physrevd.81.103532
