4 research outputs found
Interacting agegraphic dark energy models in phase space
Agegraphic dark energy, has been recently proposed, based on the so-called
Karolyhazy uncertainty relation, which arises from quantum mechanics together
with general relativity. In the first part of the article we study the original
agegraphic dark energy model by including the interaction between agegraphic
dark energy and pressureless (dark) matter. The phase space analysis was made
and the critical points were found, one of which is the attractor corresponding
to an accelerated expanding Universe.
Recent observations of near supernova show that the acceleration of Universe
decreases. This phenomenon is called the transient acceleration. In the second
part of Article we consider the 3-component Universe composed of a scalar
field, interacting with the dark matter on the agegraphic dark energy
background. We show that the transient acceleration appears in frame of such a
model. The obtained results agree with the observations.Comment: 15 pages, 5 figures, 2 table
Notes on dark energy interacting with dark matter and unparticle in loop quantum cosmology
We investigate the behavior of dark energy interacting with dark matter and
unparticle in the framework of loop quantum cosmology. In four toy models, we
study the interaction between the cosmic components by choosing different
coupling functions representing the interaction. We found that there are only
two attractor solutions namely dark energy dominated and dark matter dominated
Universe. The other two models are unstable, as they predict either a dark
energy filled Universe or one completely devoid of it.Comment: 9 pages, 10 figures. v2: Minor revisions, matches published versio
The accelerated scaling attractor solution of the interacting agegraphic dark energy in Brans-Dicke theory
We investigate the interacting agegraphic dark energy in Brans-Dicke theory
and introduce a new series general forms of dark sector coupling. As examples,
we select three cases involving a linear interaction form (Model I) and two
nonlinear interaction form (Model II and Model III). Our conclusions show that
the accelerated scaling attractor solutions do exist in these models. We also
find that these interacting agegraphic dark energy modes are consistent with
the observational data. The difference in these models is that nonlinear
interaction forms give more approached evolution to the standard CDM
model than the linear one. Our work implies that the nonlinear interaction
forms should be payed more attention.Comment: 9 pages, 10 figures, accepted in Eur. Phys. J.