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Cited by 1,064Cosmology and Gravitation TheoriesNoncommutative and Quantum Gravity TheoriesBlack Holes and Theoretical Physics

DBI in the sky: Non-Gaussianity from inflation with a speed limit

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Alishahiha, Mohsen, Silverstein, Eva, Tong, David·2004·Physical Review D
DOI 10.1103/physrevd.70.123505
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Abstract

We analyze the spectrum of density perturbations generated in models of the recently discovered ``D-cceleration'' mechanism of inflation. In this scenario, strong coupling quantum field theoretic effects sum to provide a Dirac-Born-Infeld--like action for the inflaton. We show that the model has a strict lower bound on the non-Gaussianity of the cosmic microwave background radiation power spectrum at an observable level, and is thus falsifiable. This, in particular, observationally distinguishes this mechanism from traditional slow-roll inflation generated by weakly interacting scalar fields. The model also favors a large observable tensor component to the cosmic microwave background radiation spectrum.

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  • Inflationary models with higher derivative operators, such as ghost inflation or inflation based on the Dirac-Born-Infeld action, can produce higher non-Gaussianity, possibly detectable.

    “On the other hand, inflationary models with higher derivative operators, such as ghost inflation or inflation based on the Dirac-Born-Infeld action, can produce higher non-Gaussianity [6, 7, 8, 9], possibly detectable.”

    From Non-Gaussianities in two-field inflation (2006) · cites this paper as [7]

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Authors
Alishahiha, M., Silverstein, E., & Tong, D.
Affiliations
  • Institute for Research in Fundamental Sciences (IR)
  • Stanford University (US)
  • Massachusetts Institute of Technology (US)
ORCID
Venue
Physical Review D
Publisher
American Physical Society (APS)
Published
2004-12-03
Volume
70
Issue
12
ISSN
  • 0556-2821 (ISSN-L)
  • 1550-7998
  • 1550-2368
DOI
10.1103/physrevd.70.123505
OpenAlex
W2131261154
Cited by
1,064
References
1
Citations by year
2026: 20 · 2025: 23 · 2024: 30 · 2023: 21 · 2022: 28 · 2021: 37 · 2020: 33 · 2019: 35 · 2018: 33 · 2017: 26 · 2016: 51 · 2015: 35 · 2014: 51 · 2013: 75 · 2012: 60
FWCI
30.27
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (publishedVersion)
  • arXiv (Cornell University) (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
Dirac-Born-Infeld inflation, non-Gaussianity, CMB power spectrum, density perturbations, tensor-to-scalar ratio, slow-roll inflation, falsifiability

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