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We present forecasts on the primordial non-Gaussianity parameter$f_\text{NL}$ of feature models for the future Cosmic Microwave BackgroundStage-4 (CMB-S4) experiments. The Fisher matrix of the bispectrum estimator wascomputed using noise covariances expected for preliminary CMB-S4 specificationsincluding ones for the Simons Observatory. We introduce a novel method thatimproves the computation by orthonormalising the covariance matrix. The mostsensitive CMB-S4 experiment with 1' beam and 1$\mu K$-arcmin noise would yielda factor of 1.7-2.2 times more stringent constraints compared to Planck. Underthe Simons Observatory baseline conditions the improvement would be about1.3-1.6 times to Planck. We also thoroughly studied the effects of variousmodel and experimental parameters on the forecast. Detailed analysis on theconstraints coming from temperature and E-mode polarisation, in particular,provided some insight into detecting oscillatory features in the CMBbispectrum.

CMB-S4 forecast on the primordial non-Gaussianity parameter of feature models