Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-19
Astronomy and Astrophysics
Astrophysics
Latex, 12 pages, Major changes
Scientific paper
Dark matter, the major component of the matter content of the Universe, played a significant role at early stages during structure formation. But at present the Universe is dark energy dominated as well as accelerating. Here, the presence of dark energy has been established by including a time-dependent $\Lambda$ term in the field equations. This model is compatible with the idea of an accelerating Universe so far as the value of the deceleration parameter is concerned. Possibility of a change in sign of the deceleration parameter is also discussed. The impact of considering the speed of light as variable in Einstein's Field Equations has also been investigated by using a well known time-dependent $\Lambda$ model.
Mukhopadhyay Utpal
Ray Saibal
Sarkar Ruby
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