Thawing in a coupled quintessence model
نویسندگان
چکیده
منابع مشابه
Observational constraints on thawing quintessence models
We use a dynamical systems approach to study thawing quintessence models, using a multiparameter extension of the exponential potential which can approximate the form of typical thawing potentials. We impose observational constraints using a compilation of current data, and forecast the tightening of constraints expected from future dark energy surveys, as well as discussing the relation of our...
متن کاملCoupled Quintessence
A new component of the cosmic medium, a light scalar field or ”quintessence ”, has been proposed recently to explain cosmic acceleration with a dynamical cosmological constant. Such a field is expected to be coupled explicitely to ordinary matter, unless some unknown symmetry prevents it. I investigate the cosmological consequences of such a coupled quintessence (CQ) model, assuming an exponent...
متن کاملCoupled Quintessence and Cmb
We revise the stability of the tracking solutions and briefly review the potentials of quintessence models. We discuss the evolution of linear perturbations for V (φ) = V0 exp(λφ2/2) potential in which the scalar field is non-minimally coupled to cold dark matter. We consider the effects of this coupling on both cosmic microwave background temperature anisotropies and matter perturbations. We f...
متن کاملDilaton Coupled Quintessence Potentials
Parametrization of the dark energy model is a good method by which we can construct the scalar potential directly from the effective equation of state function ωσ(z) describing the properties of the dark energy. Applying this method to the dilaton coupled quintessence(DCQ) model, we consider four parametrizations of ω(z) and investigate the features of the constructed DCQ potentials, which poss...
متن کاملQuintessence with Coupled Scalar Fields
We discuss the dynamics of a quintessence model involving two coupled scalar fields. The model presents two types of solutions, namely solutions that correspond to eternal and transient acceleration of the universe. In both cases, we obtain values for the cosmological parameters that satisfy current observational bounds as well as the nucleosynthesis constraint on the quintessence energy density.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: General Relativity and Gravitation
سال: 2016
ISSN: 0001-7701,1572-9532
DOI: 10.1007/s10714-016-2125-3