Minkowski space in f (T) gravity
The full set of solutions of f(T) gravity with the Minkowski metric is considered in this note. At the fourth order in perturbations around the trivial tetrad solution, a new mode is found explicitly. Its presence signals a strong coupling problem that transcends the Minkowski background and also suggests the ill-defined nature of cosmological solutions.
Jiménez, Jose Beltrán; Golovnev, Alexey; Koivisto, Tomi; and Veermäe, Hardi, "Minkowski space in f (T) gravity" (2021). Centre for Theoretical Physics. 198.