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SUMMARY:Systematic uncertainties in optimal de-lensing of CMB B modes with
  cross-correlation of CMB and galaxy survey
DTSTART;VALUE=DATE-TIME:20260916T094000Z
DTEND;VALUE=DATE-TIME:20260916T100500Z
DTSTAMP;VALUE=DATE-TIME:20261024T045220Z
UID:indico-contribution-31287@indico.ific.uv.es
DESCRIPTION:Speakers: Kishan Deka ()\nIn the era of high-precision Cosmic 
 Microwave Background (CMB) anisotropy measurements\, detection of primordi
 al gravitational waves (PGWs) will be one of the main goals of current CMB
  experiments. Detection of a divergence-free (B-mode) component in CMB pol
 arisation will provide direct evidence of inflationary PGWs in the early u
 niverse. However\, weak gravitational lensing of CMB photons due to interv
 ening mass distributions of the Universe distorts the primordial polarisat
 ion patterns\, introducing an additional lensing-induced B-mode signal. Re
 moving these lensing-induced B-modes is essential for improving constraint
 s on the amplitude of PGWs. In this work\, we test a tomographic delensing
  method on simulations of the Rubin Observatory LSST galaxy catalogue and 
 Simons Observatory (SO) CMB maps. A significant improvement in delensing e
 fficiency is achieved by using a multi-tracer approach\, where we split th
 e galaxy dataset into tomographic redshift bins. However\, uncertainties i
 n photometric redshift measurements pose a problem for optimal weighting o
 f the tracers. We explore the impact of photometric redshift errors with r
 ealistic simulations and build a pipeline to propagate these uncertainties
  to constraints on the amplitude of primordial gravitational waves. Additi
 onally\, we explore constraints on the galaxy bias\,b(z)\, and the amplitu
 de of matter fluctuations parameter\,σ8\, through tomographic cross-corre
 lations using realistic simulations of photometric measurements from LSST 
 10-year datasets.\n\nhttps://indico.ific.uv.es/event/8160/contributions/31
 287/
LOCATION:
URL:https://indico.ific.uv.es/event/8160/contributions/31287/
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