Dhiraj Kumar Hazra, L. Sriramkumar, Jerome Martin
We present the first complete calculation of the parameter f_NL, a quantity
introduced to characterize the extent of non-Gaussianity, for a variety of
single field inflationary models that lead to features in the scalar power
spectrum. The calculation is performed numerically by means of a new, efficient
and accurate Fortran code that can evaluate all the contributions to the
bi-spectrum in any configuration. We consider different sets of models that
lead to similar features in the scalar power spectrum, and investigate if
f_NL^{eq} (viz. f_NL evaluated in the equilateral configuration) can help us
discriminate between the models. We find that certain differences in the
background dynamics - reflected in the behavior of the slow roll parameters -
can lead to a reasonably large difference in the f_NL^{eq} generated by the
models. We close with a discussion on the implications of the results we
obtain.
View original:
http://arxiv.org/abs/1201.0926
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