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This article presents the first computation of the complete bispectrum of thecosmic microwave background temperature anisotropies arising from the evolutionof all cosmic fluids up to second order, including neutrinos. Gravitationalcouplings, electron density fluctuations and the second order Boltzmannequation are fully taken into account. Comparison to limiting cases thatappeared previously in the literature are provided. These are regimes for whichanalytical insights can be given. The final results are expressed in terms ofequivalent fNL for different configurations. It is found that for moments up tolmax=2000, the signal generated by non-linear effects is equivalent to fNL~5for both local-type and equilateral-type primordial non-Gaussianity.

The cosmic microwave background bispectrum from the non-linear evolution of the cosmological perturbations