ar X iv : a st ro - p h / 06 09 69 9 v 1 2 6 Se p 20 06 Dynamical vacuum energy , holographic quintom , and the reconstruction of scalar - field dark energy Xin
نویسنده
چکیده
When taking the holographic principle into account, the vacuum energy will acquire dynamical property that its equation of state is evolving. The current available observational data imply that the holographic vacuum energy behaves as quintom-type dark energy. We adopt the viewpoint of that the scalar field models of dark energy are effective theories of an underlying theory of dark energy. If we regard the scalar field model as an effective description of such a holographic vacuum theory, we should be capable of using the scalar field model to mimic the evolving behavior of the dynamical vacuum energy and reconstructing this scalar field model according to the fits of the observational dataset. We find the generalized ghost condensate model is a good choice for depicting the holographic vacuum energy since it can easily realize the quintom behavior. We thus reconstruct the function h(φ) of the generalized ghost condensate model using the best-fit results of the observational data.
منابع مشابه
ar X iv : a st ro - p h / 06 09 57 0 v 1 2 0 Se p 20 06 The Dark Side and its Nature
Although the cosmic concordance cosmology is quite successfull in fitting data, fine tuning and coincidence problems apparently weaken it. We review several possibilities to ease its problems, by considering various kinds of dynamical Dark Energy and possibly its coupling to Dark Matter, trying to set observational limits on Dark Energy state equation and coupling.
متن کاملDynamical Vacuum Energy, Holographic Quintom, and the Reconstruction of Scalar-field Dark Energy
When taking the holographic principle into account, the vacuum energy will acquire dynamical property that its equation of state is evolving. The current available observational data imply that the holographic vacuum energy behaves as quintom-type dark energy. We adopt the viewpoint of that the scalar field models of dark energy are effective theories of an underlying theory of dark energy. If ...
متن کاملar X iv : a st ro - p h / 06 09 04 0 v 2 2 7 Ja n 20 07 Crossing the Phantom Divide
We consider fluid perturbations close to the “phantom divide” characterised by p = −ρ and discuss the conditions under which divergencies in the perturbations can be avoided. We find that the behaviour of the perturbations depends crucially on the prescription for the pressure perturbation δp. The pressure perturbation is usually defined using the dark energy rest-frame, but we show that this f...
متن کاملar X iv : a st ro - p h / 06 09 71 1 v 1 2 6 Se p 20 06 BAIKAL Experiment : main results obtained with the neutrino telescope NT 200
The Baikal Neutrino Telescope NT200 takes data since April 1998. On April 9th, 2005, the 10 Mton scale detector NT200+ was put into operation in Lake Baikal. Selected results obtained during 1998-2002 with the neutrino telescope NT200 are presented.
متن کاملar X iv : a st ro - p h / 06 11 09 3 v 5 28 N ov 2 00 6 Direct Reconstruction of the Dark Energy Scalar - Field Potential
Chao Li, Daniel E. Holz, Asantha Cooray California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125 Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, and Department of Astronomy & Astrophysics, University of Chicago, Chicago, IL 60637 The Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101 Center for Cosmology, Department of Physics...
متن کامل