scholarly journals Irreversible thermodynamic description of interacting dark energy-dark matter cosmological models

2013 ◽  
Vol 87 (4) ◽  
Author(s):  
Tiberiu Harko ◽  
Francisco S. N. Lobo
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Thermodynamic Description ◽  
Irreversible Thermodynamic ◽  
Cosmological Models ◽  
Interacting Dark Energy

scholarly journals DO RECENT SUPERNOVAE Ia OBSERVATIONS TEND TO RULE OUT ALL THE COSMOLOGIES?

2007 ◽  
Vol 16 (10) ◽  
pp. 1641-1651 ◽  
Author(s):  
RAM GOPAL VISHWAKARMA
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Gravitational Lensing ◽  
Weakly Interacting Massive Particles ◽  
Cosmological Models ◽  
Accelerated Expansion ◽  
Standard Candle ◽  
Expansion Of The Universe ◽  
The Universe ◽  
Rule Out

Dark energy and the accelerated expansion of the universe have been the direct predictions of the distant supernovae Ia observations which are also supported, indirectly, by the observations of the CMB anisotropies, gravitational lensing and the studies of galaxy clusters. Today these results are accommodated in what has become the concordance cosmology: a universe with flat spatial sections t = constant with about 70% of its energy in the form of Einstein's cosmological constant Λ and about 25% in the form of dark matter (made of perhaps weakly-interacting massive particles). Though the composition is weird, the theory has shown remarkable successes at many fronts. However, we find that as more and more supernovae Ia are observed, more accurately and towards higher redshift, the probability that the data are well-explained by the cosmological models decreases alarmingly, finally ruling out the concordance model at more than 95% confidence level. This raises doubts against the "standard candle"-hypothesis of the supernovae Ia and their use in constraining the cosmological models. We need a better understanding of the entire SN Ia phenomenon in order to extract cosmological consequences from them.

scholarly journals Interacting dark energy and dark matter: Observational constraints from cosmological parameters

2007 ◽  
Vol 778 (1-2) ◽  
pp. 69-84 ◽  
Author(s):  
Bin Wang ◽  
Jiadong Zang ◽  
Chi-Yong Lin ◽  
Elcio Abdalla ◽  
S. Micheletti
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Cosmological Parameters ◽  
Observational Constraints ◽  
Interacting Dark Energy

scholarly journals LITTLE RIP AND PSEUDO RIP PHENOMENA FROM COUPLED DARK ENERGY

2013 ◽  
Vol 28 (37) ◽  
pp. 1350172 ◽  
Author(s):  
I. BREVIK ◽  
A. V. TIMOSHKIN ◽  
Y. RABOCHAYA
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Equation Of State ◽  
Early Universe ◽  
Equations Of State ◽  
Cosmological Models ◽  
Ideal Fluids ◽  
Interaction Term ◽  
Gravitational Equations

We consider Little Rip (LR) and Pseudo Rip (PR) cosmological models with two interacting ideal fluids, corresponding to dark energy and dark matter. The interaction between the dark energy and the dark matter fluid components is described in terms of the parameters in the equations of state for the LR and PR universes. In contrast to a model containing only a pure dark energy, the presence of the interaction term between the fluid components in the gravitational equations leads to a modification of the equation of state parameters. The properties of the early universe in this formalism are pointed out.

The Role of Dark Matter and Dark Energy in Cosmological Models: Theoretical Overview

2009 ◽  
pp. 353-365
Author(s):  
A. F. Zakharov ◽  
S. Capozziello ◽  
F. De Paolis ◽  
G. Ingrosso ◽  
A. A. Nucita
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Cosmological Models ◽  
Theoretical Overview
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