Some expanding and shearing viscous fluid cosmological models in general relativity

1988 ◽  
Vol 141 (2) ◽  
pp. 207-216 ◽  
Author(s):  
Raj Bali ◽  
Deepak Raj Jain
Keyword(s):  
General Relativity ◽  
Viscous Fluid ◽  
Cosmological Models

HIGHER-DIMENSIONAL COSMOLOGICAL MODELS WITH STRANGE QUARK MATTER

2006 ◽  
Vol 15 (04) ◽  
pp. 477-483 ◽  
Author(s):  
IHSAN YILMAZ ◽  
ATTILA ALTAY YAVUZ
Keyword(s):  
General Relativity ◽  
Quark Gluon Plasma ◽  
Quark Matter ◽  
Strange Quark ◽  
Gluon Plasma ◽  
Strange Quark Matter ◽  
Cosmological Models ◽  
Field Equations ◽  
Higher Dimensional ◽  
Different Types

In this article, we study higher-dimensional cosmological models with quark–gluon plasma in the context of general relativity. For this purpose, we consider quark–gluon plasma as a perfect fluid in the higher-dimensional universes. After solving Einstein's field equations, we have analyzed this matter for the different types of universes in the higher- and four-dimensional universes. Also, we have discussed the features of obtained solutions.

scholarly journals Selection of Cosmological Models Using QSOs

1972 ◽  
Vol 44 ◽  
pp. 471-473
Author(s):  
R. C. Roeder
Keyword(s):  
General Relativity ◽  
Steady State ◽  
Emission Line ◽  
Cosmological Models ◽  
Present Evidence ◽  
Normal Galaxy ◽  
Steady State Model ◽  
Lower Limits ◽  
Best Fit ◽  
Selection Of

It is assumed that the QSOs are at cosmological distances as indicated by their emission-line redshifts. It is further assumed, as indicated by present evidence, that none of the 21 QSOs with emission-line redshifts, ze, of 2.0 ± 0.1 (or of the 30 with ze = 2.0 ± 0.2) is screened by an intervening normal galaxy. The simplest conclusion from these data is, then, that the screening probability must be less than 0.08 (or 0.06) at ze = 2.0. This, in turn, restricts allowable cosmological models in the (σ0, q0) diagram by providing lower limits for ß0 as a function of q0. One can also rank cosmological models in order of the probability that there be no screening of the 21 (or 30) objects. In either case the steady state model ranks higher than the general relativity models found by Peach to give the best fit in the (m – z) diagram.

Plane Symmetric Viscous Fluid Cosmological Models with Varying Λ-Term

2007 ◽  
Vol 46 (11) ◽  
pp. 2774-2787 ◽  
Author(s):  
Anirudh Pradhan ◽  
Purnima Pandey ◽  
Kanti Jotania ◽  
Mahesh Kumar Yadav
Keyword(s):  
Viscous Fluid ◽  
Cosmological Models ◽  
Plane Symmetric ◽  
Varying Λ

scholarly journals Bianchi type-V string cosmological models in general relativity

Pramana ◽  
2011 ◽  
Vol 76 (4) ◽  
pp. 681-690 ◽  
Author(s):  
ANIL KUMAR YADAV ◽  
VINEET KUMAR YADAV ◽  
LALLAN YADAV
Keyword(s):  
General Relativity ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Type V ◽  
Bianchi Type V
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