Speaker
Robert Hagala
Summary
Scalar tensor (ST) theories have been studied systematically for decades, in particular to describe the dark sector of cosmos. When solving the equations of motion for the scalar field in these theories, it has been common to use the quasi-static approximation; assuming that the field sits at the bottom of the effective potential at all times.
It has been shown that in some ST theories (e.g. the symmetron), there are generated waves in the scalar field at some point in the history of the universe. We show that such waves can disrupt the evolution of the scalar field significantly. Consequentially, the fifth forces felt by matter particles can in some cases be several orders of magnitude larger than in the quasi-static case.
Author
Co-authors
Claudio Llinares
(Durham University)
David F. Mota
(University of Oslo)
