scholarly journals Configuration entropy in the ΛCDM and the dynamical dark energy models: Can we distinguish one from the other?

2018 ◽  
Vol 482 (3) ◽  
pp. 3219-3226 ◽  
Author(s):  
Biswajit Das ◽  
Biswajit Pandey
Keyword(s):  
Dark Energy ◽  
The Other ◽  
Configuration Entropy ◽  
Energy Models ◽  
Dynamical Dark Energy

scholarly journals Can we constrain the dark energy equation of state parameters using configuration entropy?

2019 ◽  
Vol 492 (3) ◽  
pp. 3928-3939
Author(s):  
Biswajit Das ◽  
Biswajit Pandey
Keyword(s):  
Dark Energy ◽  
Equation Of State ◽  
Energy Equation ◽  
State Parameter ◽  
Entropy Rate ◽  
Configuration Entropy ◽  
Energy Models ◽  
Equation Of State Parameter ◽  
Best Fitting ◽  
Dynamical Dark Energy

ABSTRACT We propose a new scheme for constraining the dark energy equation of state parameter/parameters based on the study of the evolution of the configuration entropy. We analyse a set of one-parameter and two-parameter dynamical dark energy models and find that the derivative of the configuration entropy in all the dynamical dark energy models exhibits a minimum. The magnitude of the minimum of the entropy rate is decided by both the parametrization of the equation of state and the associated parameters. The location of the minimum of the entropy rate is less sensitive to the form of the parametrization but depends on the associated parameters. We determine the best-fitting equations for the location and magnitude of the minimum of the entropy rate in terms of the parameter/parameters of the dark energy equation of state. These relations would allow us to constrain the dark energy equation of state parameter/parameters for any given parametrization provided the evolution of the configuration entropy in the Universe is known from observations.

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 Addressing the high-f problem in pseudo-Nambu–Goldstone boson dark energy models with dark matter–dark energy interaction

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Upala Mukhopadhyay ◽  
Avik Paul ◽  
Debasish Majumdar
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Dark Energy Model ◽  
Goldstone Boson ◽  
The Other ◽  
Mass Limit ◽  
Energy Models ◽  
Energy Interaction ◽  
Energy Scenario ◽  
Type Potential

AbstractWe consider a dark energy scenario driven by a scalar field $$\phi $$ ϕ with a pseudo-Nambu–Goldstone boson (pNGB) type potential $$V(\phi )=\mu ^4 \left( 1+ \mathrm{cos}(\phi /f) \right) $$ V ( ϕ ) = μ 4 1 + cos ( ϕ / f ) . The pNGB originates out of breaking of spontaneous symmetry at a scale f close to Planck mass $$M_\mathrm{{pl}}$$ M pl . We consider two cases namely the quintessence dark energy model with pNGB potential and the other, where the standard pNGB action is modified by the terms related to Slotheon cosmology. We demonstrate that for this pNGB potential, high-f problem is better addressed when the interaction between dark matter and dark energy is taken into account and that Slotheon dark energy scenario works even better over quintessence in this respect. To this end, a mass limit for dark matter is also estimated.

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 STATEFINDER PARAMETERS FOR QUINTOM DARK ENERGY MODEL

2005 ◽  
Vol 14 (11) ◽  
pp. 1873-1881 ◽  
Author(s):  
PUXUN WU ◽  
HONGWEI YU
Keyword(s):  
Dark Energy ◽  
Kinetic Energy ◽  
Dark Energy Model ◽  
Scalar Fields ◽  
Energy Model ◽  
The Other ◽  
Energy Term ◽  
Statefinder Parameters ◽  
Energy Models ◽  
Kinetic Energy Term

We perform in this paper a statefinder diagnostic to a dark energy model with two scalar fields, called "quintom," where one of the scalar fields has a canonical kinetic energy term and the other has a negative one. Several kinds of potentials are discussed. Our results show that the statefinder diagnostic can differentiate quintom model with other dark energy models.

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