  We explore possible non-Gaussian features of primordial gravitational waves
by constructing model-independent templates for nonlinearity parameters of
tensor bispectrum. Our analysis is based on Effective Field Theory of inflation
that relies on no particular model as such and thus the results are quite
generic. The analysis further reveals that chances of detecting squeezed limit
tensor bispectrum are fairly higher than equilateral limit. We also discuss
prospects of detectability in upcoming CMB missions.
