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Extended scalar-tensor theories of gravity / Marco Crisostomi, Kazuya Koyama, Gianmassimo Tasinato

Journal of Cosmology and Astroparticle Physics, Volume: 2016, Issue: 04, Pages: 044 - 044

Swansea University Author: Gianmassimo Tasinato

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Abstract

We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications. We derive the conditions for the existence of a primary constraint that prevents the propagation of an additional dangerous mode associated with...

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Published in: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
Published: 2016
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa28506
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Abstract: We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications. We derive the conditions for the existence of a primary constraint that prevents the propagation of an additional dangerous mode associated with higher order equations of motion. We then classify the most general, consistent scalar-tensor theories that are at most quadratic in the second derivatives of the scalar field. In addition, we investigate the possible connection between these theories and (beyond) Horndeski through conformal and disformal transformations. Finally, we point out that these theories can be associated with new operators in the effective field theory of dark energy, which might open up new possibilities to test dark energy models in future surveys.
Item Description: Article funded by SCOAP. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
College: College of Science
Issue: 04
Start Page: 044
End Page: 044