Stationary Universe in General Relativity and Lyra's Geometry

1994 ◽  
Vol 42 (1) ◽  
pp. 71-93 ◽  
Author(s):  
T. Singh ◽  
Anil K. Agrawal
Keyword(s):  
General Relativity ◽  
Lyra’S Geometry ◽  
Stationary Universe

scholarly journals Analysis of Bianchi Type V Holographic Dark Energy Models in General Relativity and Lyra’s Geometry

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Daba Meshesha Gusu ◽  
M. Vijaya Santhi
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Dark Energy ◽  
Energy Density ◽  
Bianchi Type ◽  
Holographic Dark Energy ◽  
Holographic Dark Energy Model ◽  
Expansion Scalar ◽  
Lyra’S Geometry ◽  
Type V

In this paper, we analyze anisotropic and homogeneous Bianchi type V spacetime in the presence of dark matter and holographic dark energy model components in the framework of general relativity and Lyra’s geometry. The solutions of differential equation fields have been obtained by considering two specific cases, namely, the expansion scalar θ in the model is proportional to the shear scalar σ and the average scale factor taken as hybrid expansion form. The solutions for field equations are obtained in general relativity and Lyra’s geometry. The energy density of dark matter in both natures was obtained and compared so that the energy density of dark matter in general relativity is slightly different from the energy density of dark matter in Lyra’s geometry. A similar behavior occurred in case of pressure and EoS parameter of holographic dark energy model in respective frameworks. Also, it is concluded that the physical parameters such as the average Hubble parameter, spatial volume, anisotropy parameter, expansion scalar, and shear scalar are the same in both frameworks. Moreover, it is observed that the gauge function β t is a decreasing function of cosmic time in Lyra’s geometry, and for late times, the gauge function β t converges to zero and Lyra’s geometry reduces to general relativity in all respects. Finally, we conclude that our models are a close resemblance to the Λ CDM cosmological model in late times and consistent with the recent observations of cosmological data.

General Relativity

2006 ◽  
Author(s):  
M. P. Hobson ◽  
G. P. Efstathiou ◽  
A. N. Lasenby
Keyword(s):  
General Relativity
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