We compute the correlation functions of 3 and 4 stress energy tensors (T)
in D=3 in free field theories of scalars, abelian gauge fields, and fermions,
which are relevant in the analysis of cosmological non-gaussianities. These
correlators appear in the holographic expressions of the scalar and tensor
perturbations derived for holographic cosmological models. The result is simply
adapted to describe the leading contributions in the gauge coupling to the same
correlators also for a non abelian SU(N) gauge theory. In the case of the
bispectrum, our results are mapped and shown to be in full agreement with the
corresponding expressions given in a recent holographic study by Bzowski,
McFadden and Skenderis. In the 4-T case we present the completely traced
amplitude plus all the contact terms. These are expected to appear in a fourth
order extension of the holographic formulas for the 4-point functions of scalar
metric perturbations.Comment: 29 pages, 3 figure