Version | v1 |
Release Date | 2013-01-20 |
Primary Language | en
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Can an interacting varying Chaplygin gas and tachyonic matter accelerate
Universe?
release_2y67oxi7mzhvzcpxmbm5uvguci
by
Martiros Khurshudyan
Abstract
In this paper a possibility to accelerated the expansion of the large scale
universe due to interacting varying Chaplygin gas of a specific form and a
tachyonic matter is considered. A specific form of the potential and
appropriate values of the parameters allow to obtain early tachyonic dark
matter with ω_T≈ 0 in recent Universe as well. On the other
hand, related to the structure of the field equations describing the dynamics
of the background we assumed the form of non-gravitational interaction to be
given in advance. A sing changeable interaction between dark energy and dark
matter is also included due to a huge interest towards it in recent literature.
Possible future finite time singularities for cansidered models have been
determined to finalize the paper. The study shows that in case of
non-interacting model, the fate of the Universe will be either Type II (The
Sudden Singularity), or Type IV (Generalized Sudden Singularity) singularity.
On the other hand, the consideration of Q=3 b H ρ_de non-gravitational
interaction in addition to Type II and Type IV singularities will induce also
Type V (ω-singularity) singularity. Whilst in the model with Q=3 b q H
ρ_de non-gravitational interaction only Type IV singularity will be
observed. Moreover, 2 forms of the scale factor has been considered
separately allowing analytically obtain the behavior of the cosmological
parameters without specifying an explicit form of the potential for tachyonic
matter.
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Stage
submitted
Date 2013-01-20
Version
v1
1301.4990v1
grouping other versions (eg, pre-print) and variants of this release
State is "active".
Revision:
7bdb475d-b8a6-411a-9edc-29d9c9edad3f
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