Speaker: Dario Bettoni
In this talk I will discuss the most general disformal transformation that acting on the Horndeski action preserves second order field equations and discuss the issue of viable frames for this kind of theories, in particular the possibility to cast the action in the so called Einstein frame.
I will also present a phenomenological application of this work, in which dark matter is non-minimally coupled to the Einstein tensor and investigate its the consequences at both background and linear perturbation level.