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Several fields would leave a measurable correlation between large and small ripples.","posed_since":"","precise":"Measure the local bispectrum amplitude $f_{\\mathrm{NL}}^{\\mathrm{local}}$; Planck 2018 gives $f_{\\mathrm{NL}}^{\\mathrm{local}} = -0.9 \\pm 5.1$. Single-field inflation predicts $\\left|f_{\\mathrm{NL}}^{\\mathrm{local}}\\right| \\ll 1$ in the squeezed limit; many multi-field models give $\\left|f_{\\mathrm{NL}}^{\\mathrm{local}}\\right| \\ge 1$. 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