Lensing anomalies from the epoch of reionisation. (arXiv:1906.05042v1 [astro-ph.CO])

<a href="http://arxiv.org/find/astro-ph/1/au:+Fidler_C/0/1/0/all/0/1">Christian Fidler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lesgourgues_J/0/1/0/all/0/1">Julien Lesgourgues</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ringeval_C/0/1/0/all/0/1">Christophe Ringeval</a>

Reionisation blurring is a non-linear correction to the cosmic microwave

background that acts similar to weak gravitational lensing and that can be

computed from linear perturbations through a blurring potential. Its impact on

the cosmic microwave background is roughly two order of magnitude smaller than

that of lensing, in isolation. But the blurring potential is strongly

correlated with the lensing potential thereby generating a potentially

observable cross-correlation. We compute for the first time the impact of

reionisation blurring on the temperature angular power spectrum and discuss how

much it could induce lensing anomalies

Reionisation blurring is a non-linear correction to the cosmic microwave

background that acts similar to weak gravitational lensing and that can be

computed from linear perturbations through a blurring potential. Its impact on

the cosmic microwave background is roughly two order of magnitude smaller than

that of lensing, in isolation. But the blurring potential is strongly

correlated with the lensing potential thereby generating a potentially

observable cross-correlation. We compute for the first time the impact of

reionisation blurring on the temperature angular power spectrum and discuss how

much it could induce lensing anomalies

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