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 languageEnglish
Article number050
Pages (from-to)050
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number6
Early online date30 Jun 2015
DOIs
Publication statusPublished - Jun 2015

Keywords

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

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