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We explore the effect of a cubic correction gnl*phi^3 on the mass functionand bias of dark matter haloes extracted from a series of large N-bodysimulations and compare it to theoretical predictions. Such cubic terms can bemotivated in scenarios like the curvaton model, in which a large cubiccorrection can be produced while simultaneously keeping the quadratic fnl*phi^2correction small. The deviation from the Gaussian halo mass function is inreasonable agreement with the theoretical predictions. The scale-dependent biascorrection Delta b_kappa(k,gnl) measured from the auto- and cross-powerspectrum of haloes, is similar to the correction in fnl models, but theamplitude is lower than theoretical expectations. Using the compilation of LSSdata in Slosar et al. (2008), we obtain for the first time a limit on gnl of-3.5*10^5 < gnl < +8.2*10^5 (at 95% CL). This limit will improve with thefuture LSS data by 1-2 orders of magnitude, which should test many of thescenarios of this type.

Signature of primordial non-Gaussianity of phi^3-type in the mass function and bias of dark matter haloes