Higher order corrections of the extended Chaplygin gas cosmology with varying $$G$$ G and $$\Lambda $$ Λ

Kahya, E. O.; Khurshudyan, Martiros; Pourhassan, B.; Myrzakulov, Ratbay; Pasqua, Antonio

doi:10.1140/epjc/s10052-015-3263-6

Cited by 70 publications

(49 citation statements)

References 86 publications

(100 reference statements)

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“…One sees that the power law function of the energy density of the DM is considered. The ghost DE model, Equation (32), may also be understood as an example of a fluid introduced in References [43,44]. The first model considered in Reference [60] is a cosmological scenario where DE and DM do not interact.…”

Section: Non-interacting Modelmentioning

confidence: 99%

On the Phenomenology of an Accelerated Large-Scale Universe

Khurshudyan

2016

Symmetry

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Abstract:In this review paper, several new results towards the explanation of the accelerated expansion of the large-scale universe is discussed. On the other hand, inflation is the early-time accelerated era and the universe is symmetric in the sense of accelerated expansion. The accelerated expansion of is one of the long standing problems in modern cosmology, and physics in general. There are several well defined approaches to solve this problem. One of them is an assumption concerning the existence of dark energy in recent universe. It is believed that dark energy is responsible for antigravity, while dark matter has gravitational nature and is responsible, in general, for structure formation. A different approach is an appropriate modification of general relativity including, for instance, f (R) and f (T) theories of gravity. On the other hand, attempts to build theories of quantum gravity and assumptions about existence of extra dimensions, possible variability of the gravitational constant and the speed of the light (among others), provide interesting modifications of general relativity applicable to problems of modern cosmology, too. In particular, here two groups of cosmological models are discussed. In the first group the problem of the accelerated expansion of large-scale universe is discussed involving a new idea, named the varying ghost dark energy. On the other hand, the second group contains cosmological models addressed to the same problem involving either new parameterizations of the equation of state parameter of dark energy (like varying polytropic gas), or nonlinear interactions between dark energy and dark matter. Moreover, for cosmological models involving varying ghost dark energy, massless particle creation in appropriate radiation dominated universe (when the background dynamics is due to general relativity) is demonstrated as well. Exploring the nature of the accelerated expansion of the large-scale universe involving generalized holographic dark energy model with a specific Nojiri-Odintsov cut-off is presented to finalize the paper.

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Section: Non-interacting Modelmentioning

confidence: 99%

On the Phenomenology of an Accelerated Large-Scale Universe

Khurshudyan

2016

Symmetry

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“…The holographic model of dark energy based on Chaplygin gas equation of state already investigated for GCG, now we can construct new model based on the extended Chaplygin gas equation of state [32][33][34][35],…”

Section: +007mentioning

confidence: 99%

Interacting holographic extended Chaplygin gas and phantom cosmology in the light of BICEP2

2015

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Abstract:In this paper, we study the holographic dark energy density and interacting extended Chaplygin gas energy density in the Einstein gravity. We reconstruct the scalar field and the scalar potential describing the extended Chaplygin gas. In the special case, we obtain energy density and investigate some cosmological parameters. Assuming interaction between components we find energy density for some different parametrization of total EoS. We analyze tensor to scalar ratio and use recent observational data of BICEP2 to fix the model parameters.

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“…[8]) and Chaplygin gas (cf. [12,23]). Although this class has some success, such materials do not exist on the Earth or in the Solar system.…”

Section: Modifications Of the Rhs Of (11) (Physical Class)mentioning

confidence: 99%

Unification Principle and a Geometric Field Theory

2015

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Abstract:In the context of the geometrization philosophy, a covariant field theory is constructed. The theory satisfies the unification principle. The field equations of the theory are constructed depending on a general differential identity in the geometry used. The Lagrangian scalar used in the formalism is neither curvature scalar nor torsion scalar, but an alloy made of both, the W-scalar. The physical contents of the theory are explored depending on different methods. The analysis shows that the theory is capable of dealing with gravity, electromagnetism and material distribution with possible mutual interactions. The theory is shown to cover the domain of general relativity under certain conditions.

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Higher order corrections of the extended Chaplygin gas cosmology with varying $$G$$ G and $$\Lambda $$ Λ

Cited by 70 publications

References 86 publications

On the Phenomenology of an Accelerated Large-Scale Universe

On the Phenomenology of an Accelerated Large-Scale Universe

Interacting holographic extended Chaplygin gas and phantom cosmology in the light of BICEP2

Unification Principle and a Geometric Field Theory

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