Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/04/044
Keywords
gravity; modified gravity
Funding
- U.K. Science and Technology Facilities Council [ST/K00090X/1]
- European Research Council [646702]
- STFC grant [ST/N001435/1]
- Science and Technology Facilities Council [ST/L000369/1, ST/N000668/1, ST/K00090X/1] Funding Source: researchfish
- STFC [ST/L000369/1, ST/K00090X/1, ST/N000668/1] Funding Source: UKRI
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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.
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