Extended scalar-tensor theories of gravity
- Institute of Cosmology and Gravitation, University of Portsmouth,Burnaby Road, Portsmouth, PO1 3FX (United Kingdom)
- Department of Physics, Swansea University,Singleton Park, Swansea, SA2 8PP (United Kingdom)
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.
- Sponsoring Organization:
- SCOAP3, CERN, Geneva (Switzerland)
- OSTI ID:
- 22572066
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 04; Other Information: PUBLISHER-ID: JCAP04(2016)044; OAI: oai:repo.scoap3.org:15318; cc-by Article funded by SCOAP3. 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.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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