Standard theories tell us that, at some point in the Universe's evolution, free quarks and gluons must have become bound together into the hadronic matter we see today. But was this transition abrupt or smooth?
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Aoki, Y., Endrődi, G., Fodor, Z., Katz, S. D. & Szabó, K. K. Nature 443, 675–678 (2006).
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Wilczek, F. Did the Big Bang boil?. Nature 443, 637–638 (2006). https://doi.org/10.1038/443637a