scholarly journals Unified dark fluid and cosmic transit models in Brans–Dicke theory

2020 ◽  
Vol 30 ◽  
pp. 100722
Author(s):  
Sunil K. Tripathy ◽  
Sasmita Kumari Pradhan ◽  
Zashmir Naik ◽  
Dipanjali Behera ◽  
B. Mishra
Keyword(s):  
Dark Fluid

scholarly journals Constraining the dark fluid

2009 ◽  
Vol 80 (8) ◽  
Author(s):  
Martin Kunz ◽  
Andrew R. Liddle ◽  
David Parkinson ◽  
Changjun Gao
Keyword(s):  
Dark Fluid

scholarly journals Cosmological dark fluid from five-dimensional vacuum

2011 ◽  
Vol 84 (2) ◽  
Author(s):  
Luz M. Reyes ◽  
José Edgar Madriz-Aguilar ◽  
L. Arturo Ureña-López
Keyword(s):  
Dark Fluid

scholarly journals Teleparallelism by inhomogeneous dark fluid

2015 ◽  
Vol 359 (2) ◽  
Author(s):  
Ertan Güdekli ◽  
Aizhan Myrzakul ◽  
Ratbay Myrzakulov
Keyword(s):  
Dark Fluid

Bianchi Type-III Magnetized Wet Dark Fluid Cosmological Model in General Relativity

2010 ◽  
Vol 50 (2) ◽  
pp. 339-348 ◽  
Author(s):  
K. S. Adhav ◽  
M. V. Dawande ◽  
R. S. Thakare ◽  
R. B. Raut
Keyword(s):  
General Relativity ◽  
Cosmological Model ◽  
Bianchi Type ◽  
Wet Dark Fluid ◽  
Type Iii ◽  
Dark Fluid

Bouncing scenario in Brans–Dicke theory

2020 ◽  
Vol 17 (04) ◽  
pp. 2050056
Author(s):  
Sunil Kumar Tripathy ◽  
Subingya Pandey ◽  
Alaka Priyadarsini Sendha ◽  
Dipanjali Behera
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Equation Of State ◽  
Linear Equation ◽  
Scale Factor ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Dark Fluid

A bouncing scenario is studied in the framework of generalized Brans–Dicke theory. In order to have a dark energy (DE) driven late time cosmic acceleration, we have considered a unified dark fluid simulated by a linear equation of state (EoS). The evolutionary behavior of the DE equation of parameter derived from the unified dark fluid has been discussed. The effect of the bouncing scale factor on the Brans–Dicke parameter, self-interacting potential and the Brans–Dicke scalar field is investigated.

scholarly journals Condensation to a strongly correlated dark fluid of two dimensional dipolar excitons

2017 ◽  
Vol 108 ◽  
pp. 88-97 ◽  
Author(s):  
Yotam Mazuz-Harpaz ◽  
Kobi Cohen ◽  
Ronen Rapaport
Keyword(s):  
Strongly Correlated ◽  
Two Dimensional ◽  
Dark Fluid

scholarly journals Astronomical bounds on the modified Chaplygin gas as a unified dark fluid model

2019 ◽  
Vol 623 ◽  
pp. A28
Author(s):  
Hang Li ◽  
Weiqiang Yang ◽  
Liping Gai
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Fluid Model ◽  
Chaplygin Gas ◽  
Linear Perturbation ◽  
Model Parameters ◽  
Modified Chaplygin Gas ◽  
Dark Fluid ◽  
Type Ia ◽  
Linear Perturbation Theory

The modified Chaplygin gas could be considered to abide by the unified dark fluid model because the model might describe the past decelerating matter dominated era and at present time it provides an accelerating expansion of the Universe. In this paper, we have employed the Planck 2015 cosmic microwave background anisotropy, type-Ia supernovae, observed Hubble parameter data sets to measure the full parameter space of the modified Chaplygin gas as a unified dark matter and dark energy model. The model parameters Bs, α, and B determine the evolutional history of this unified dark fluid model by influencing the energy density ρMCG = ρMCG0[Bs + (1 − Bs)a−3(1 + B)(1 + α)]1/(1 + α). We assumed the pure adiabatic perturbation of unified modified Chaplygin gas in the linear perturbation theory. In the light of Markov chain Monte Carlo method, we find that Bs = 0.727+0.040+0.075−0.039−0.079, α = −0.0156+0.0982+0.2346−0.1380−0.2180, B = 0.0009+0.0018+0.0030−0.0017−0.0030 at 2σ level. The model parameters α and B are very close to zero and the nature of unified dark energy and dark matter model is very similar to cosmological standard model ΛCDM.

scholarly journals Dissipative unified dark fluid model

2019 ◽  
Vol 28 (09) ◽  
pp. 1950110
Author(s):  
Esraa Elkhateeb
Keyword(s):  
Dark Energy ◽  
Fluid Model ◽  
Dynamical Behavior ◽  
Power Laws ◽  
Viscosity Coefficient ◽  
Distance Modulus ◽  
Effective Equation ◽  
Dark Fluid ◽  
System Solution ◽  
The Universe

We consider a unified barotropic dark fluid model with dissipation. Our fluid asymptotes between two power laws and so can interpolate between the dust and dark energy (DE) equations-of-state at early and late times. The dissipative part is a bulk viscous part with constant viscosity coefficient. The model is analyzed using the phase-space methodology which helps to understand the dynamical behavior of the model in a robust manner without reference to the system solution. The parameters of the model are constrained through many observational constraints. The model is tested through many physical and observational tests. We first considered the model independent [Formula: see text] test. Results for [Formula: see text] are plotted against the BAO data for this quantity from different authors, which shows that the model is consistent with the data points for the full redshift range. The [Formula: see text] statistics results in the value of [Formula: see text] with a [Formula: see text]-value of [Formula: see text]. The Hubble parameter equation is solved numerically and results are plotted against the recent set of Hubble data. The [Formula: see text] test with the Hubble data resulted in the [Formula: see text] value of [Formula: see text] with a [Formula: see text]-value of [Formula: see text]. The distance modulus at different values of redshift is calculated numerically and results are compared to the newest set of SNe Ia data, the Pantheon Sample. We obtained a [Formula: see text] value of [Formula: see text] with a [Formula: see text]-value of [Formula: see text]. These results show that our model is efficiently consistent with observations. The model expectations for the evolution of the universe are also studied by testing the evolution of the deceleration parameter, the density of the universe, and the effective equation-of-state parameter of the model and of its underlying dark energy candidate. The value of the present day viscosity coefficient of the cosmic fluid, [Formula: see text], is estimated. It is found to be [Formula: see text][Formula: see text]Pa[Formula: see text]s. We argue that this model is able to explain the behavior of the universe evolution.

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