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Cited by 1,455Cosmology and Gravitation TheoriesNoncommutative and Quantum Gravity TheoriesDark Matter and Cosmic Phenomena

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Generating the curvature perturbation without an inflaton

Open access
Lyth, David H, Wands, David·2002·Physics Letters B
DOI 10.1016/s0370-2693(01)01366-1
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Abstract

We present a mechanism for the origin of the large-scale curvature perturbation in our Universe by the late decay of a massive scalar field, the curvaton. The curvaton is light during a period of cosmological inflation, when it acquires a perturbation with an almost scale-invariant spectrum. This corresponds initially to an isocurvature density perturbation, which generates the curvature perturbation after inflation when the curvaton density becomes a significant fraction of the total. The isocurvature density perturbation disappears if the curvaton completely decays into thermalised radiation. Any residual isocurvature perturbation is 100% correlated with the curvature. The same mechanism can also generate the curvature perturbation in pre-big bang/ekpyrotic models, provided that the curvaton has a suitable non-canonical kinetic term so as to generate a flat spectrum.

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  • It is important that the daughter vacuum be created via tunneling (Coleman-De Luccia instanton) as opposed to quantum diffusion over the barrier (Hawking-Moss instanton), because the former gives a handle on the initial geometry of the daughter universe.

    “It is important to this work that the daughter vacuum be created via tunneling (Coleman-De Luccia instanton), as opposed to by quantum diffusion over the barrier (Hawking-Moss instanton [42]), because the former gives us a handle on the initial geometry of the daughter universe.”

    From Observable effects of anisotropic bubble nucleation (2010) · cites this paper as [42]

    Split into 2 atoms — 0 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 2 unverifiable. Expand the claim to see per-atom verdicts.

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Research works printed but not linked: 32

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Metadata

Authors
Lyth, D. H., & Wands, D.
Affiliations
  • Lancaster University (GB)
  • University of Portsmouth (GB)
Corresponding author
Wands, David
ORCID
Wands, David
Venue
Physics Letters B
Publisher
Elsevier BV
Published
2002-01
Volume
524
Issue
1-2
Pages
5-14
ISSN
0370-2693 (ISSN-L)
DOI
10.1016/s0370-2693(01)01366-1
OpenAlex
W1979147028
Cited by
1,455
References
0
Citations by year
2026: 53 · 2025: 41 · 2024: 41 · 2023: 38 · 2022: 29 · 2021: 34 · 2020: 32 · 2019: 41 · 2018: 60 · 2017: 44 · 2016: 71 · 2015: 50 · 2014: 76 · 2013: 98 · 2012: 91
FWCI
39.35
Type
journal article
Language
en
Open access
Licence
Locations
  • Physics Letters B (publishedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
  • Lancaster EPrints (Lancaster University) (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 › Dark Matter and Cosmic Phenomena
Keywords
curvaton, curvature perturbations, curvaton decay, cosmic inflation, non-canonical kinetic terms, scale-invariant spectrum, primordial perturbations

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