Scalar–tensor models of normal and phantom dark energy
نویسندگان
چکیده
منابع مشابه
Cosmological Perturbations in Phantom Dark Energy Models
The ΛCDM paradigm, characterised by a constant equation of state w = −1 for dark energy, is the model that better fits observations. However, the same observations strongly support the possibility of a dark energy content where the corresponding equation of state is close to but slightly smaller than −1. In this regard, we focus on three different models where the dark energy content is describ...
متن کاملPhantom Dark Energy Models with Negative Kinetic Term
We examine phantom dark energy models derived from a scalar field with a negative kinetic term for which V (φ) → ∞ asymptotically. All such models can be divided into three classes, corresponding to an equation of state parameter wφ with asymptotic behavior wφ → −1, wφ → w0 < −1, and wφ → −∞. We derive the conditions on the potential V (φ) which lead to each of these three types of behavior. Fo...
متن کاملA Unified Model of Phantom Energy and Dark Matter
To explain the acceleration of the cosmological expansion researchers have considered an unusual form of mass-energy generically called dark energy. Dark energy has a ratio of pressure over mass density which obeys w = p/ρ < −1/3. This form of massenergy leads to accelerated expansion. An extreme form of dark energy, called phantom energy, has been proposed which has w = p/ρ < −1. This possibil...
متن کاملNon-minimally coupled canonical, phantom and quintom models of holographic dark energy
We investigate canonical, phantom and quintom models, with the various fields being nonminimally coupled to gravity, in the framework of holographic dark energy. We classify them and we discuss their cosmological implications. In particular, we examine the present value of the dark energy equation-of-state parameter and the crossing through the phantom divide, and we extract the conditions for ...
متن کاملParametrization of Born-Infeld Type Phantom Dark Energy Model
Applying the parametrization of dark energy density, we can construct directly independent-model potentials. In Born-Infeld type phantom dark energy model, we consider four special parametrization equation of state parameter. The evolutive behavior of dark energy density with respect to red-shift z, potentials with respect to φ and z are shown mathematically. Moreover, we investigate the effect...
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: Journal of Cosmology and Astroparticle Physics
سال: 2006
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2006/09/016