scholarly journals Cosmological instabilities and the role of matter interactions in dynamical dark energy models

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
William J. Wolf ◽  
Macarena Lagos
Keyword(s):  
Dark Energy ◽  
Energy Models ◽  
Dynamical Dark Energy

scholarly journals Testing for dynamical dark energy models with redshift-space distortions

2013 ◽  
Vol 2013 (01) ◽  
pp. 030-030 ◽  
Author(s):  
Shinji Tsujikawa ◽  
Antonio De Felice ◽  
Jailson Alcaniz
Keyword(s):  
Dark Energy ◽  
Energy Models ◽  
Dynamical Dark Energy

scholarly journals Roles of Dark Energy Perturbations in Dynamical Dark Energy Models: Can We Ignore Them?

2009 ◽  
Vol 103 (15) ◽  
Author(s):  
Chan-Gyung Park ◽  
Jai-chan Hwang ◽  
Jae-heon Lee ◽  
Hyerim Noh
Keyword(s):  
Dark Energy ◽  
Energy Models ◽  
Dynamical Dark Energy

scholarly journals Constraints on Dynamical Dark Energy Models from the Abundance of Massive Galaxies at High Redshifts

2020 ◽  
Vol 900 (2) ◽  
pp. 108
Author(s):  
N. Menci ◽  
A. Grazian ◽  
M. Castellano ◽  
P. Santini ◽  
E. Giallongo ◽  
...  
Keyword(s):  
Dark Energy ◽  
Massive Galaxies ◽  
Energy Models ◽  
Dynamical Dark Energy

Interacting dynamical dark energy with stable high-scale cosmological perturbations at radiation-dominated epoch

2021 ◽  
pp. 2150154
Author(s):  
Roman Neomenko
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Coupling Parameter ◽  
Gravitational Interaction ◽  
State Parameter ◽  
Model Parameters ◽  
Cosmological Perturbations ◽  
Energy Models ◽  
The Impact ◽  
Dynamical Dark Energy

In this paper, the cosmological perturbations of dynamical dark energy and dark matter, which interact non-gravitationally are studied. This dark energy–dark matter non-gravitational interaction is linearly dependent on the energy densities of dark components. However, in the interacting quintessence dark energy models with such type of interaction, the non-adiabatic instabilities of cosmological perturbations at radiation-dominated epoch arise. To avoid this problem, the model of dynamical dark energy was chosen as the basis. Here, the equation of state parameter of dark energy evolves in time but can be assumed constant at early epoch, so this model can be tuned in such a way that the non-adiabatic instabilities would not appear. The drawback of this cosmological model is that the energy densities of dark components can take the negative values for the certain range of interaction parameter, so the conditions for positivity of dark components densities were derived. Using obtained constraints on the model parameters, the impact of coupling parameter on modification of cosmological perturbations’ evolution is analyzed.

scholarly journals Growth rate in the dynamical dark energy models

2014 ◽  
Vol 74 (11) ◽  
Author(s):  
Olga Avsajanishvili ◽  
Natalia A. Arkhipova ◽  
Lado Samushia ◽  
Tina Kahniashvili
Keyword(s):  
Growth Rate ◽  
Dark Energy ◽  
Energy Models ◽  
Dynamical Dark Energy
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