Cited by 57Cosmology and Gravitation TheoriesNoncommutative and Quantum Gravity TheoriesBlack Holes and Theoretical Physics

Finding Horndeski theories with Einstein gravity limits

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McManus, Ryan, Lombriser, Lucas, Peñarrubia, Jorge·2016·Journal of Cosmology and Astroparticle Physics

Abstract

The Horndeski action is the most general scalar-tensor theory with at most second-order derivatives in the equations of motion, thus evading Ostrogradsky instabilities and making it of interest when modifying gravity at large scales. To pass local tests of gravity, these modifications predominantly rely on nonlinear screening mechanisms that recover Einstein's Theory of General Relativity in regions of high density. We derive a set of conditions on the four free functions of the Horndeski action that examine whether a specific model embedded in the action possesses an Einstein gravity limit or not. For this purpose, we develop a new and surprisingly simple scaling method that identifies dominant terms in the equations of motion by considering formal limits of the couplings that enter through the new terms in the modified action. This enables us to find regimes where nonlinear terms dominate and Einstein's field equations are recovered to leading order. Together with an efficient approximation of the scalar field profile, one can then further evaluate whether these limits can be attributed to a genuine screening effect. For illustration, we apply the analysis to both a cubic galileon and a chameleon model as well as to Brans-Dicke theory. Finally, we emphasise that the scaling method also provides a natural approach for performing post-Newtonian expansions in screened regimes.

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  1. [9]9. C. Deffayet, X. Gao, D.A. Steer and G. Zahariade, From k-essence to generalised Galileons, Phys. Rev. D 84 (2011) 064039 [arXiv:1103.3260] [INSPIRE]. · arXiv
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Authors
McManus, R., Lombriser, L., & Peñarrubia, J.
Affiliations
Royal Observatory (GB)
Venue
Journal of Cosmology and Astroparticle Physics
Published
2016-11-04
Volume
2016
Issue
11
Pages
006-006
ISSN
  • 1475-7508 (ISSN-L)
  • 1475-7516
OpenAlex
W2412649928
Cited by
57
References
51
Citations by year
2023: 5 · 2022: 5 · 2021: 8 · 2020: 12 · 2019: 18 · 2018: 5 · 2017: 1 · 2016: 3
FWCI
4.17
Type
journal article
Language
en
Open access
Locations
  • Journal of Cosmology and Astroparticle Physics (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (161058)
  • Science and Technology Facilities Council (ST/M001229/1)
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, nonlinear screening, modified gravity, scaling methods, cubic Galileon, Brans-Dicke theory, post-Newtonian approximation

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