Speaker
Martin Mosny
Description
Compared to standard cosmology, string cosmologies motivate an extended period of kination that can be followed by a cosmological tracker and then an epoch of moduli domination. Conventionally, such trackers occur when there is a scalar field with an exponential potential and an additional fluid whose energy balances the kinetic and potential energy of the scalar field. In this talk we show that a tracker can also be reached even when the universe only contains a scalar field, with no additional fluid. In this case perturbations in the scalar field can effectively behave like a radiation fluid, leading to a radiation tracker at late times.
