Abstract
The past decade has seen a growing interaction between particle physicists and cosmologists on the history of the very early Universe. Partly as a result, the prevailing view is that, for all but the first fraction of a second of its existence, the Universe has expanded in accordance with a model built on general relativity – the Einstein–de Sitter model – that predicts an age of about 15 billion years, give or take a few billion. Occasional observations have raised questions about the model, but these have had significant uncertainties attached to them and so far the model has proved resilient. But results from the Hubble Space Telescope (HST) published last month are now raising the prospect that the “standard model” of cosmology might predict an age that is too young to be tolerable.
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