Numerical evaluation of the tensor bispectrum in two field inflation

Understand

We evaluate the dimensionless non-Gaussianity parameter $h_{_{\rm NL}}$, that characterizes the amplitude of the tensor bispectrum, numerically for a class of two field inflationary models such as double inflation, hybrid inflation and aligned natural inflation.

• We compare the numerical results with the slow roll results which can be obtained analytically.
• In the context of double inflation, we also investigate the effects on $h_{_{\rm NL}}$ due to curved trajectories in the field space.
• We explicitly examine the validity of the consistency relation governing the tensor bispectrum in the squeezed limit.