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We investigate future constraints on primordial local-type non-Gaussianityfrom 21 cm angular power spectrum from minihalos. We particularly focus on thetrispectrum of primordial curvature perturbations which are characterized bythe non-linearity parameters $\tau_{\rm NL}$ and $g_{\rm NL}$. We show thatfuture measurements of minihalo 21 cm angular power spectrum can probe thesenon-linearity parameters with an unprecedented precision of $\tau_{\rmNL}\sim30$ and $g_{\rm NL}\sim2\times10^3$ for Square Kilometre Array (SKA) and$\tau_{\rm NL}\sim0.6$ and $g_{\rm NL}\sim8\times10^2$ for Fast FourierTransform Telescope (FFTT). These levels of sensitivity would give significantimplications for models of the inflationary Universe and the origin of cosmicdensity fluctuations.

Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos