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

Camille Bonvin; Chris Clarkson; Ruth Durrer; Roy Maartens; Obinna Umeh

doi:10.1088/1475-7516/2015/06/050

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

Camille Bonvin, Chris Clarkson, Ruth Durrer, Roy Maartens, Obinna Umeh

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Abstract

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 area distance to the CMB plays in the presence of second-order lensing corrections.

Original language	English
Article number	050
Pages (from-to)	050
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2015
Issue number	6
Early online date	30 Jun 2015
DOIs	https://doi.org/10.1088/1475-7516/2015/06/050
Publication status	Published - Jun 2015

Keywords

CMBR theory
cosmological parameters from CMBR
gravitational lensing
RCUK
STFC
ST/K0090X/1

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10.1088/1475-7516/2015/06/050

1503.07831Accepted author manuscript (Post-print), 251 KB

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

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