Current Constraints on the Equation of State of Dark Energy and Quintom Models

par Li Hong (DAPU, Beijing)

lundi 4 déc. 2006, 14:00 → 15:00 Europe/Paris

Amphithéâtre

In my talk, firstly, I will present the global fitting results on the equation of state of dark energy with the 3 year Wilkinson Microwave Anisotropy Probe (WMAP3), Sloan Digital Sky Survey (SDSS), the 2dF Galaxy Redshift Survey (2dFGRS) and type Ia Supernovae (SN Ia) data. Probing the dynamics of dark energy is the most important aspect of the dark energy research. During my talk I will focus on the dynamical dark energy models, at the same time I will introduce how to handle the dark energy perturbation in a fully consistent way. In the second part I will introduce Quintom dark energy model which delineate a scenario of dark energy where the equation of state gets across the cosmological constant boundary w=-1 during the evolution. Being a dynamical dark energy component, the scalar fields are expected to interact with the ordinary matters. In the third part, I will move to interacting dark energy. I will introduce Neutrino Quintom model which we propose by introducing a coupling between the neutrinos and the Phantom field. Using the 157 'gold' sample of Type Ia Supernova I will present the constraints on this model. An interesting prediction of this model is the neutrino mass variation, and I will introduce the possibility of testing it with the short ? ray burst.