Darker Side of the Universe

Details Darker Side of the Universe Darker Side of the Universe

2005-10-17

arxiv.org/abs/astro-ph/0510492v1

Proceedings of the 29th International Cosmic Ray Conference 10: 47-62 (2005)

Astronomy and Astrophysics

Astrophysics

Invited Review Talk at the 29th International Cosmic Ray Conference, Aug 3-10, 2005, Pune, India; to appear in the proceedings

Scientific paper

Observations suggest that nearly seventy per cent of the energy density in the universe is unclustered and exerts negative pressure. Theoretical understanding of this component (`dark energy'), which is driving an accelerated expansion of the universe, is {\it the} problem in cosmology today. I discuss this issue with special emphasis on the cosmological constant as the possible choice for the dark energy. Several curious features of a universe with a cosmological constant are described and some possible approaches to understand the nature of the cosmological constant are discussed.

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