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Effective description of generalized disformal theories
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Generalized disformal transformations enable us to construct the generalized disformal Horndeski theories, which form the most general class of ghost-free scalar-tensor theories to this date. We extend the effective field theory (EFT) of cosmological perturbations to incorporate these generalized disformal Horndeski theories. The main difference from the conventional EFT is that our extended EFT involves operators with higher spatial derivatives of the lapse function. Our EFT also accommodates the generalized disformal transformation of U-DHOST theories.
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A New Definition of Horndeski Theory and the Possibility of Multiple Scalar Field Extensions
Horndeski theory is re-characterized as the disformally-closed class anchored to a minimal seed action, reproducing the known single-field action and generating multi-field antisymmetric terms, with full multi-field v...
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