Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/02/031
Keywords
modified gravity; cosmology of theories beyond the SM; dark energy theory
Funding
- US Department of Energy (HEP) Award [DE-SC0013528]
- NASA ATP grant [NNX11AI95G]
- Center for Particle Cosmology
- NASA [143925, NNX11AI95G] Funding Source: Federal RePORTER
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We discuss the extent to which it is necessary to include higher-derivative operators in the effective field theory of general scalar-tensor theories. We explore the circumstances under which it is correct to restrict to second-order operators only, and demonstrate this using several different techniques, such as reduction of order and explicit field redefinitions. These methods are applied, in particular, to the much-studied Horndeski theories. The goal is to clarify the application of effective field theory techniques in the context of popular cosmological models, and to explicitly demonstrate how and when higher-derivative operators can be cast into lower-derivative forms suitable for numerical solution techniques.
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