Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-24
Phys.Rev.D79:023501,2009
Astronomy and Astrophysics
Astrophysics
minor typos fixed, acknowledgement and reference added
Scientific paper
10.1103/PhysRevD.79.023501
The perturbations in the electron number density during recombination contributes to the Cosmic Microwave Background bispectrum through second order terms. Perturbations in the electron density can be a factor of ~5 larger than the baryon density fluctuations on large scales as shown in the calculations by Novosyadlyj. This raises the possibility that the contribution to bispectrum arising from perturbations in the optical depth may be non-negligible. We calculate this bispectrum and find it to peak for squeezed triangles and of peak amplitude of the order of primordial non-Gaussianity of local type with fNL of 0.05 ~ -1 depending on the l-modes being considered. This is because the shape of the bispectrum is different from the primordial one although it peaks for squeezed configurations, similar to the local type primordial non-Gaussianity.
Khatri Rishi
Wandelt Benjamin D.
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