Speaker: Claudio Llinares (University of Oslo)

Abstract:

In the context of scalar tensor theories for gravity, there is a
universally adopted hypothesis when running N-body simulations that time
derivatives in the equation of motion of the scalar field can be
neglected. While the approximation greatly simplifies the simulation
techniques, its validity is still a matter of debate. I will present a
method that can be used to simulate scalar fields beyond the static
approximation as well as results coming from non-static cosmological
simulations in the context of the symmetron models. These non-static
symmetron simulations show in particular that the model can lead to the
formation of domain walls. I will conclude by reviewing our latest
results on the properties of these particular topological defects.