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We derive a formula for the halo/galaxy bispectrum on the basis of theintegrated Perturbation Theory (iPT). In addition to the gravity-inducednon-Gaussianity, we consider the non-Gaussianity of the primordial curvatureperturbations, and investigate in detail the effect of such primordialnon-Gaussianity on the large-scale halo/galaxy bispectrum. In iPT, the effectsof primordial non-Gaussianity are wholly encapsulated in the linear(primordial) polyspectra, and we systematically calculate the contributions tothe large-scale behaviors arising from the three types of primordial bispectrum(local-, equilateral-, and orthogonal-types), and primordial trispectrum of thelocal-type non-Gaussianity. We find that the equilateral- and orthogonal-typenon-Gaussianities show distinct scale-dependent behaviors which can dominatethe gravity-induced non-Gaussianity at very large scales. For the local-typenon-Gaussianity, higher-order loop corrections are found to give asignificantly large contribution to the halo/galaxy bispectrum of the squeezedshape, and eventually dominate over the other contributions on large scales. Adiagrammatic approach based on the iPT helps us to systematically investigatean impact of such higher-order contributions to the large-scale halo/galaxybispectrum.

Halo/Galaxy Bispectrum with Primordial non-Gaussianity from integrated Perturbation Theory (iPT)