Galactic entropy in extended Kaluza–Klein cosmology

Yanar, Hilmi; Saltı, Mustafa; Aydoğdu, Oktay; Açıkgöz, İrfan; Yaşar, Erol

doi:10.1142/s0217732316500383

Cited by 6 publications

(2 citation statements)

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“…The deceleration parameter q for the five dimensional EKK is written via the case of model I as [74]:…”

Section: The Ggde Modelmentioning

confidence: 99%

Ghost scalar field dark energy models from an extended Kaluza–Klein perspective

Korunur

2021

Class. Quantum Grav.

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Reconstruction process of scalar field models (quintessence, tachyon, dilaton and K-essence), which can be performed by making use of some dark energy density definitions such as holographic, Ricci, new agegraphic and ghost types proposals, has been an interesting and very attractive area to many physicists in literature. In this work, in a five-dimensional framework, we establish a correspondence between the quintessence, tachyon and the dilaton type scalar field definitions and the generalized ghost dark energy model by considering the extended form of the Kaluza–Klein (EKK) gravity. Accordingly, we numerically study the associated equation of state parameters, as well as their kinetic energy and scalar potential terms.

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“…The deceleration parameter q for the five dimensional EKK is written via the case of model I as [74]:…”

Section: The Ggde Modelmentioning

confidence: 99%

Ghost scalar field dark energy models from an extended Kaluza–Klein perspective

Korunur

2021

Class. Quantum Grav.

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“…In f(T) gravity, the GSLT is satisfied from early to present times but is violated for special ranges of the torsion scalar [40]. Black hole thermodynamics play an important role in current modifications of Einstein's field equations and are well documented in the literature [41][42][43][44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Second law of gravitational thermodynamics in the locally rotationally symmetric Bianchi type-II universe

Korunur¹

2017

Turk J Phys

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Abstract:In this work, under the assumption that the universe is locally rotationally symmetric (LRS) Bianchi type-II and filled with anisotropic dark fluid (dark energy and dark radiation), we investigate whether the generalized second law of thermodynamics (GSLT) is still valid. We also consider another important condition for LRS Bianchi type-II spacetimes whereby the model expansion θ is proportional to the shear σ , which leads to B = A n (where n is a constant and A and B are the metric potentials). Based on this, we derive a general circumstance for the GSLT and find that its validity depends on the anisotropies of both the dark fluid and the metric potentials. We conclude that the GSLT still holds at all times even if these two anisotropic conditions are removed from the results.

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