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Implications of the Planck bispectrum constraints for the primordial trispectrum

Byrnes, Christian T.; Nurmi, Sami; Tasinato, Gianmassimo +1 more

The new Planck constraints on the local bispectrum parameter f_NL are about 10⁵ times tighter than the current constraints on the trispectrum parameter g_NL , which means that the allowed numerical values of the second-and third-order terms in the perturbative expansion of the curvature perturbation are comparable. We show that a conseq…