Speaker
Abdolali Banihashemi
(U Oslo)
Description
In this talk, I will discuss a model of extended quintessence in which a scalar field is non-minimally coupled to gravity, serving as a candidate for dark energy. I will present its properties at both the background and linear perturbation levels. While the non-minimal coupling is constructed to satisfy local tests of gravity without need to introduce screening mechanisms, the model exhibits interesting features in both regimes, including phantom crossing and the potential to alleviate the Hubble tension. All computations are performed using a modified version of the Boltzmann code hi_class.