Dynamics of the universe with disformal coupling between the dark sectors
Abstract We use a dynamical analysis to study the evolution of the universe at late time for the model in which the interaction between dark energy and dark matter is inspired by a disformal transformation. We extend the analysis in the existing literature by assuming that the disformal coefficient...
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2017-05-01
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Series: | European Physical Journal C: Particles and Fields |
Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-4924-4 |
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doaj-8bb272de11e74a1e9e74fda873847a4b2020-11-25T01:01:53ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522017-05-0177511110.1140/epjc/s10052-017-4924-4Dynamics of the universe with disformal coupling between the dark sectorsKhamphee Karwan0Stharporn Sapa1The Institute for Fundamental Study “The Tah Poe Academia Institute”, Naresuan UniversityThe Institute for Fundamental Study “The Tah Poe Academia Institute”, Naresuan UniversityAbstract We use a dynamical analysis to study the evolution of the universe at late time for the model in which the interaction between dark energy and dark matter is inspired by a disformal transformation. We extend the analysis in the existing literature by assuming that the disformal coefficient depends both on the scalar field and its kinetic terms. We find that the dependence of the disformal coefficient on the kinetic term of scalar field leads to two classes of the scaling fixed points that can describe the acceleration of the universe at late time. The first class exists only for the case where the disformal coefficient depends on the kinetic terms. The fixed points in this class are saddle points unless the slope of the conformal coefficient is sufficiently large. The second class can be viewed as the generalization of the fixed points studied in the literature. According to the stability analysis of these fixed points, we find that the stable fixed point can take two different physically relevant values for the same value of the parameters of the model. These different values of the fixed points can be reached for different initial conditions for the equation of state parameter of dark energy. We also discuss the situations in which this feature disappears.http://link.springer.com/article/10.1140/epjc/s10052-017-4924-4 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Khamphee Karwan Stharporn Sapa |
spellingShingle |
Khamphee Karwan Stharporn Sapa Dynamics of the universe with disformal coupling between the dark sectors European Physical Journal C: Particles and Fields |
author_facet |
Khamphee Karwan Stharporn Sapa |
author_sort |
Khamphee Karwan |
title |
Dynamics of the universe with disformal coupling between the dark sectors |
title_short |
Dynamics of the universe with disformal coupling between the dark sectors |
title_full |
Dynamics of the universe with disformal coupling between the dark sectors |
title_fullStr |
Dynamics of the universe with disformal coupling between the dark sectors |
title_full_unstemmed |
Dynamics of the universe with disformal coupling between the dark sectors |
title_sort |
dynamics of the universe with disformal coupling between the dark sectors |
publisher |
SpringerOpen |
series |
European Physical Journal C: Particles and Fields |
issn |
1434-6044 1434-6052 |
publishDate |
2017-05-01 |
description |
Abstract We use a dynamical analysis to study the evolution of the universe at late time for the model in which the interaction between dark energy and dark matter is inspired by a disformal transformation. We extend the analysis in the existing literature by assuming that the disformal coefficient depends both on the scalar field and its kinetic terms. We find that the dependence of the disformal coefficient on the kinetic term of scalar field leads to two classes of the scaling fixed points that can describe the acceleration of the universe at late time. The first class exists only for the case where the disformal coefficient depends on the kinetic terms. The fixed points in this class are saddle points unless the slope of the conformal coefficient is sufficiently large. The second class can be viewed as the generalization of the fixed points studied in the literature. According to the stability analysis of these fixed points, we find that the stable fixed point can take two different physically relevant values for the same value of the parameters of the model. These different values of the fixed points can be reached for different initial conditions for the equation of state parameter of dark energy. We also discuss the situations in which this feature disappears. |
url |
http://link.springer.com/article/10.1140/epjc/s10052-017-4924-4 |
work_keys_str_mv |
AT khampheekarwan dynamicsoftheuniversewithdisformalcouplingbetweenthedarksectors AT stharpornsapa dynamicsoftheuniversewithdisformalcouplingbetweenthedarksectors |
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1725206987901239296 |