CMB lensing extraction and primordial non-Gaussianity

Details CMB lensing extraction and primordial non-Gaussianity CMB lensing extraction and primordial non-Gaussianity

2004-12-21

arxiv.org/abs/astro-ph/0412551v1

Phys.Rev. D71 (2005) 103514

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevD.71.103514

The next generation of CMB experiments should get a better handle on cosmological parameters by mapping the weak lensing deflection field, which is separable from primary anisotropies thanks to the non-Gaussianity induced by lensing. However, the generation of perturbations in the Early Universe also produces a level of non-Gaussianity which is known to be small, but can contribute to the anisotropy trispectrum at the same level as lensing. In this work, we study whether the primordial non-Gaussianity can mask the lensing statistics. We concentrate only on the ``temperature quadratic estimator'' of lensing, which will be nearly optimal for the Planck satellite, and work in the flat-sky approximation. We find that primordial non-Gaussianity contaminates the deflection field estimator by roughly (0.1 f_NL)% at large angular scales, which represents at most a 10% contribution, not sufficient to threaten lensing extraction, but enough to be taken into account.

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