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Dark Energy: the Cosmological Challenge of the Millennium
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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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Cited by 1 Pith paper
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Deriving the Cosmological Constant and Nature's Constants from SU(3) Confinement Volume
The paper claims that the dark energy density equals the Planck-scale gluon zero-point energy divided by N = (R_u/R_p)^3 ≈ 10^123, with each QCD domain mapping to a Planck-area patch on the cosmic horizon.
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