Cosmology Seminar: Robert Hagala

Robert Hagala is a Doctoral Research Fellow at ITA

Title: Scalar field phenomenology in Disformally coupled Quintessence
The Quintessence model is a simple alternative to GR, where a cosmological scalar field is responsible for the cosmic acceleration when rolling down a potential. Here, I consider an extension of this model by coupling the scalar field to matter through a disformal interaction. This introduces perturbations to the field evolution, as well as fifth forces acting on the matter distribution. I present the model of Disformally coupled Quintessence, and discuss newly discovered phenomena in the evolution of the scalar field in this model. I will show results from recent N-body simulations, including the field evolution on non-linear scales, and the possibility for repulsive fifth forces.
Published Feb. 23, 2019 8:44 PM - Last modified Feb. 25, 2019 12:45 PM