Sala Lauree (Dip. di Fisica - Edificio G. Marconi)
Sala Lauree
Dip. di Fisica - Edificio G. Marconi
Description
Although inflation has been paraded as an observational success, the lack of a firm prediction applicable to the whole of the paradigm should be seen as a major drawback, at least until information external to cosmology selects a priori one of its many models. In contrast I present a theory with two disformal metrics, one for matter fields, another for gravity, which has the benefit of making a sharp prediction for the spectral index of the scalar fluctuations, and the amount of tensor modes. The origin of the fluctuations in this theory is thermal rather than quantum, and the model is a critical boundary in the space of all theories, associated in at least two ways with a phase transition. I discuss other implications of the model, namely non-Gaussianty. I also review similar models loosely based on the Horava Lifshtz theory, with a far less developed cosmology, but closer connections with quantum gravity.
