Journal
COMMUNICATIONS IN THEORETICAL PHYSICS
Volume 51, Issue 2, Pages 367-374Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0253-6102/51/2/36
Keywords
string; inhomogeneous universe; cylindrical symmetry; variable cosmological term; bulk viscosity
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Funding
- Inter-University Centre for Astronomy and Astrophysics, Pune, India
- Centre for Theoretical Physics, Jamia Millia Islamia, NewDelhi, India
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Some cylindrically symmetric inhomogeneous viscous fluid string cosmological models with magnetic field and cosmological term Lambda varying with time are investigated. To get the deterministic solution, it has been assumed that the expansion (theta) in the model is proportional to the eigen value sigma(1)(1) of the shear tensor sigma(i)(j). The value of cosmological constant for the model is found to be small and positive, which is supported by the results from recent supernovae Ia observations. The effect of bulk viscosity is to produce a change in perfect fluid and hence exhibits essential influence on the character of the solution. The physical and geometric properties of the models are also discussed in presence and absence of magnetic field.
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