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Cited by 328Cosmology and Gravitation TheoriesNoncommutative and Quantum Gravity TheoriesBlack Holes and Theoretical Physics

Galilean genesis: an alternative to inflation

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Creminelli, Paolo, Nicolis, Alberto, Trincherini, Enrico·2010·Journal of Cosmology and Astroparticle Physics
DOI 10.1088/1475-7516/2010/11/021
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Abstract

We propose a novel cosmological scenario, in which standard inflation is replaced by an expanding phase with a drastic violation of the Null Energy Condition (NEC): >> H 2 . The model is based on the recently introduced Galileon theories, which allow NEC violating solutions without instabilities. The unperturbed solution describes a Universe that is asymptotically Minkowski in the past, expands with increasing energy density until it exits the regime of validity of the effective field theory and reheats. This solution is a dynamical attractor and the Universe is driven to it, even if it is initially contracting. The study of perturbations of the Galileon field reveals some subtleties, related to the gross violation of the NEC and it shows that adiabatic perturbations are cosmologically irrelevant. The model, however, suggests a new way to produce a scale invariant spectrum of isocurvature perturbations, which can later be converted to adiabatic: the Galileon is forced by symmetry to couple to the other fields as a dilaton; the effective metric it yields on the NEC violating solution is that of de Sitter space, so that all light scalars will automatically acquire a nearly scale-invariant spectrum of perturbations.

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  • Galileon fields have been used to construct monsters of the type discussed above, including loitering, inflationary and bouncing cosmologies [37,40-44] and other exotic cosmological solutions [45-47].

    “Because of their ability to violate the NEC, Galileon fields have been used to construct monsters of the type discussed above, including loitering, inflationary and bouncing cosmologies [37,40 -44] and other exotic cosmological solutions [45 -47].”

    From Past-completeness of inflationary spacetimes (2023) · cites this paper as [40]

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Authors
Creminelli, P., Nicolis, A., & Trincherini, E.
Affiliations
The Abdus Salam International Centre for Theoretical Physics (ICTP) (IT)
ORCID
Creminelli, Paolo
Venue
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Published
2010-11-17
Volume
2010
Issue
11
Pages
021-021
ISSN
  • 1475-7508 (ISSN-L)
  • 1475-7516
DOI
10.1088/1475-7516/2010/11/021
OpenAlex
W2086217832
Cited by
328
References
22
Citations by year
2026: 9 · 2025: 13 · 2024: 15 · 2023: 12 · 2022: 6 · 2021: 18 · 2020: 20 · 2019: 13 · 2018: 16 · 2017: 18 · 2016: 37 · 2015: 23 · 2014: 26 · 2013: 27 · 2012: 34
FWCI
18.23
Type
journal article
Language
en
Open access
Locations
  • Journal of Cosmology and Astroparticle Physics (publishedVersion)
  • arXiv (Cornell University) (publishedVersion)
  • CERN Document Server (European Organization for Nuclear Research) (submittedVersion, other-oa)
  • Scuola Normale Superiore di Pisa (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
alternative to inflation, null energy condition violation, dynamical attractors, isocurvature perturbations, adiabatic perturbations, scale-invariant spectrum, dilaton coupling, reheating, primordial power spectrum

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