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News and Views
Nature 431, 519-520 (30 September 2004) | doi:10.1038/431519b; Published online 29 September 2004
Cosmology: What is dark energy?
Lawrence M. Krauss1
Abstract
It seems that the rate of expansion of the Universe is accelerating, driven by the so-called dark energy. Is Einstein's cosmological constant behind it? There might be a way to find out.
The nature of the 'dark energy' that is causing the apparent accelerated expansion of the Universe is, without doubt, the biggest mystery in physics and astronomy. Although it was astrophysical observations of the acceleration that led to the discovery of dark energy, there are precious few tests that can be performed to work out what dark energy is — whether it is simply the rebirth of Einstein's cosmological constant, or whether it might stem from something even weirder.
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