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gr-qc2026
Unscreened multipole moments of the fifth force in the EFT of dark energy
Tsutomu Kobayashi, Toshiki Takadera
It has been argued that degenerate higher-order scalar-tensor theories and the effective field theory (EFT) of dark energy are endowed with the Vainshtein mechanism, resulting in a…
gr-qc2023
Weak-field regime of scalar-tensor theories with an instantaneous mode
Tsutomu Kobayashi, Takashi Hiramatsu
Higher-order scalar-tensor theories having an instantaneous mode do not develop the Ostrogradsky instability even if a seemingly dangerous mode is present. Such theories satisfy on…