Speaker
Tsutomo Kobayashi
(Rikkyo University)
Description
We study the weak-gravity regime of higher-order scalar-tensor theories that are degenerate in the unitary gauge. In a certain subset of theories analogous to Lorentz-violating scalar-tensor theories, we show that the Vainshtein mechanism due to nonlinear derivative interactions does not work. For this family of theories we determine all the PPN parameters in terms of the EFT of dark energy parameters and discuss the experimental bounds.
External references
- 24070046
- 72eca4a5-d9c0-4704-adab-1d530b996891
