Observational data now offer strong support for inflation — a period of exponentially fast expansion in the early history of the Universe. But is the theory complete?
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Gratton, S., Steinhardt, P. Beyond the inflationary border. Nature 423, 817–818 (2003). https://doi.org/10.1038/423817a
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DOI: https://doi.org/10.1038/423817a
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