Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.331..679p&link_type=abstract
Astrophysics and Space Science, Volume 331, Issue 2, pp.679-687
Astronomy and Astrophysics
Astrophysics
1
Massive String, Exact Solution, Perfect Fluid, Vacuum Energy Density Λ
Scientific paper
Exact solution of Einstein's field equations is obtained for massive string cosmological model of Bianchi III space-time using the technique given by Letelier (Phys. Rev. D 20:2414, 1983) in presence of perfect fluid and decaying vacuum energy density Λ. To get the deterministic solution of the field equations the expansion θ in the model is considered as proportional to the eigen value σ2_{ 2} of the shear tensor σj_{ i} and also the fluid obeys the barotropic equation of state. The vacuum energy density Λ is found to be positive and a decreasing function of time which is supported by the results from recent supernovae Ia observations. It is also observed that in early stage of the evolution of the universe string dominates over the particle whereas the universe is dominated by massive string at the late time. Some physical and geometric properties of the model are also discussed.
Amirhashchi Hassan
Pradhan Anirudh
Zainuddin Hishamuddin
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