Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Do we care about the distance to the CMB? Clarifying the impact of second-order lensing

27. March 2015
Cite as: 
C. Bonvin, C. Clarkson, D. Durrer, R. Maartens, O. Umeh [arXiv:1503.07831].
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It has recently been shown that second-order corrections to the background distance-redshift
relation can build up significantly at large redshifts, due to an aggregation of gravitational lensing
events. This shifts the expectation value of the distance to the CMB by 1%. In this paper we show
that this shift is already properly accounted for in standard CMB analyses. We clarify the role that
the distance to the CMB plays in the presence of second-order lensing corrections.


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