In the News & Views 'Ultracold gases: Shock cooling a universe' (Nature Physics 9, 605–606; 2013) by Martin W. Zwierlein the first sentence of the seventh paragraph should have read 'A topological defect can only form where at least three regions of different <Ψ> meet on a line, and only if the angle of <Ψ> changes by a non-zero multiple of 2π as one goes around that line — the marble makes a non-zero number of round trips around the Mexican hat'. This error was unfortunately introduced during the editorial process. Corrected after print 7 November 2013.

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    The online version of the original article can be found at 10.1038/nphys2773

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    Correction. Nature Phys 9, 760 (2013).

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