How Sensitive is the CMB to a Single Lens?

Details How Sensitive is the CMB to a Single Lens? How Sensitive is the CMB to a Single Lens?

2011-05-15

arxiv.org/abs/1105.2940v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in JCAP, 24 pages, 5 figures

Scientific paper

We study the imprints of a single lens, that breaks statistical isotropy, on the CMB and calculate the signal to noise ratio (S/N) for its detection. We emphasize the role of non-Gaussianities induced by LCDM weak lensing in this calculation and show that typically the S/N is much smaller than expected. In particular we find that the hypothesis that a void (texture) is responsible for the WMAP cold spot can barely (cannot) be tested via weak lensing of the CMB.

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