2 papers
gr-qc2026
Healthy scalar-tensor theories with third-order derivatives: Generalized disformal Horndeski and beyond
Masaki Michiwaki, Tsutomu Kobayashi
We systematically construct ghost-free scalar-tensor theories whose Lagrangian includes up to third-order derivatives of the scalar field. Using a spatially covariant action writte…
gr-qc2025
Gravitomagnetic tidal response of relativistic stars in partially screened scalar-tensor theories
Tsutomu Kobayashi
In scalar-tensor theories beyond Horndeski, the Vainshtein screening mechanism is only partially effective inside astrophysical bodies. We investigate the potential to detect this…