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General analysis of Noether symmetries in Horndeski gravity

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arxiv 2408.09018 v1 pith:MR4J74E6 submitted 2024-08-16 gr-qc astro-ph.COhep-th

General analysis of Noether symmetries in Horndeski gravity

classification gr-qc astro-ph.COhep-th
keywords gravityhorndeskinoethersymmetriescoupledgeneralscalar-tensoranalysis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore Noether symmetries of Horndeski gravity, extending the classification of general scalar-tensor theories. Starting from the minimally coupled scalar field and the first-generation scalar-tensor gravity, the discussion is generalised to kinetic gravity braiding and Horndeski gravity. We highlight the main findings by focusing on the non-minimally coupled Gauss-Bonnet term and the extended cuscuton model. Finally, we discuss how the presence of matter can influence Noether symmetries. It turns out that the selected Horndeski functions are unchanged with respect to the vacuum case.

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