#scalar-tensor theory
topicscalar-tensor theory
2 papers · 1 filter
gr-qc2026
Physical nonviability of in the scalar-tensor representation
Jose Beltrán Jiménez, Alejandro Jiménez Cano, Tomi S. Koivisto
The authors demonstrate that the scalar‑tensor representation of f(Q) gravity inevitably contains a propagating ghost degree of freedom, confirming its physical non‑viability.
gr-qc2026
A New Definition of Horndeski Theory and the Possibility of Multiple Scalar Field Extensions
Tomoki Katayama
The paper introduces a new axiomatic definition of Horndeski scalar‑tensor theory, recovers the standard single‑field action, and outlines a systematic approach for constructing mu…