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Utilizing the Maldacena formalism and extending the earlier efforts tocompute the scalar bi-spectrum, we construct a numerical procedure to evaluatethe three-point scalar-tensor cross-correlations as well as the tensorbi-spectrum in single field inflationary models involving the canonical scalarfield. We illustrate the accuracy of the adopted procedure by comparing thenumerical results with the analytical results that can be obtained in thesimpler cases of power law and slow roll inflation. We also carry out such acomparison in the case of the Starobinsky model described by a linear potentialwith a sudden change in the slope, which provides a non-trivial and interesting(but, nevertheless, analytically tractable) scenario involving a brief periodof deviation from slow roll. We then utilize the code we have developed toevaluate the three-point correlation functions of interest (and thecorresponding non-Gaussianity parameters that we introduce) for an arbitrarytriangular configuration of the wavenumbers in three different classes ofinflationary models which lead to features in the scalar power spectrum, ashave been recently considered by the Planck team. We also discuss thecontributions to the three-point functions during preheating in inflationarymodels with a quadratic minimum. We conclude with a summary of the main resultswe have obtained.

Numerical evaluation of the three-point scalar-tensor cross-correlations and the tensor bi-spectrum