Dark Energy: the Cosmological Challenge of the Millennium

Details Dark Energy: the Cosmological Challenge of the Millennium Dark Energy: the Cosmological Challenge of the Millennium

2004-11-02

arxiv.org/abs/astro-ph/0411044v1

Curr.Sci.88:1057,2005

Astronomy and Astrophysics

Astrophysics

Invited article; to appear in Current Science (special section on Cosmology); revtex4; 3 figs; 13 pages

Scientific paper

Recent cosmological observations suggest that nearly seventy per cent of the energy density in the universe is unclustered and has negative pressure. Several conceptual issues related to the modeling of this component (`dark energy'), which is driving an accelerated expansion of the universe, are discussed with special emphasis on the cosmological constant as the possible choice for the dark energy. Some curious geometrical features of a universe with a cosmological constant are described and a few attempts to understand the nature of the cosmological constant are reviewed.

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