Pith. sign in

REVIEW 5 cited by

Generalized disformal Horndeski theories: cosmological perturbations and consistent matter coupling

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2209.02176 v2 pith:ZYQ2PTA3 submitted 2022-09-06 gr-qc astro-ph.COhep-th

Generalized disformal Horndeski theories: cosmological perturbations and consistent matter coupling

Kazufumi Takahashi , Masato Minamitsuji , Hayato Motohashi This is my paper
classification gr-qc astro-ph.COhep-th
keywords theoriesdisformalhorndeskiperturbationsclassconditionscosmologicalgeneralized
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
0 comments
read the original abstract

Invertible disformal transformations are a useful tool to investigate ghost-free scalar-tensor theories. By performing a higher-derivative generalization of the invertible disformal transformation on Horndeski theories, we construct a novel class of ghost-free scalar-tensor theories, which we dub generalized disformal Horndeski theories. Specifically, these theories lie beyond the quadratic/cubic DHOST class. We explore cosmological perturbations to identify a subclass where gravitational waves propagate at the speed of light and clarify the conditions for the absence of ghost/gradient instabilities for tensor and scalar perturbations. We also investigate the conditions under which a matter field can be consistently coupled to these theories without introducing unwanted extra degrees of freedom.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Inverting no-hair theorems: How requiring General Relativity solutions restricts scalar-tensor theories

    gr-qc 2025-03 accept novelty 7.0

    Requiring stealth Schwarzschild and de Sitter solutions in quadratic/cubic scalar-tensor theories eliminates odd-parity deviations from GR when all solutions are required, while allowing some deviations and non-trivia...

  2. A New Definition of Horndeski Theory and the Possibility of Multiple Scalar Field Extensions

    gr-qc 2025-11 conditional novelty 6.0

    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...

  3. Primordial black hole dark matter from ultra-slow-roll inflation in Horndeski gravity

    gr-qc 2025-12 conditional novelty 5.0

    A kinetic cubic Horndeski coupling creates an ultra-slow-roll phase that amplifies curvature perturbations enough to produce asteroid-mass primordial black holes, potentially 90% of dark matter.

  4. Gravitational Wave Birefringence from Fuzzy Dark Matter

    gr-qc 2024-06 unverdicted novelty 5.0

    Fuzzy dark matter induces frequency-dependent amplitude birefringence in gravitational waves with periodic time modulation set by the scalar mass, but no velocity birefringence.

  5. EFT of Dark Energy with Cosmic Chronometers: Reconstructing Background EFT Functions

    astro-ph.CO 2025-12 unverdicted novelty 4.0

    Reconstruction of EFT background functions from cosmic chronometer Hubble data allows model-independent tests of dark energy evolution in scalar-tensor theories.