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SUMMARY:Improved delensing of CMB B-modes with upcoming SO and LSST Year-1
  data
DTSTART;VALUE=DATE-TIME:20261020T121500Z
DTEND;VALUE=DATE-TIME:20261020T123500Z
DTSTAMP;VALUE=DATE-TIME:20261112T103444Z
UID:indico-contribution-2263@events.ncbj.gov.pl
DESCRIPTION:Speakers: Kishan Deka (NCBJ (BP4))\nIn the era of high-precisi
 on Cosmic Microwave Background (CMB) anisotropy measurements\, detection o
 f primordial gravitational waves (PGWs) is one of the main goals of curren
 t CMB experiments. Detection of a divergence-free (B-mode) component in CM
 B polarisation will provide direct evidence of inflationary PGWs in the ea
 rly universe. However\, weak gravitational lensing of CMB photons due to i
 ntervening mass distribution of the Universe distorts the primordial polar
 isation patterns\, introducing an additional lensing-induced B-mode signal
 . Removing these lensing-induced B-modes is essential for improving constr
 aints on the amplitude of PGWs. In this work\, we test a tomographic delen
 sing method on simulations of the Rubin Observatory LSST galaxy catalogue 
 and Simons Observatory (SO) CMB maps. A significant improvement in delensi
 ng efficiency is achieved by using a multi-tracer approach\,\nwhere we spl
 it the galaxy dataset into tomographic redshift bins. However\, uncertaint
 ies in photometric redshift measurements pose a problem for optimal weight
 ing of the tracers. In this work\, we set up a pipeline to perform a multi
 -tracer delensing method and studied the impact of photometric redshift er
 rors\, using realistic simulations of LSST galaxy catalogue and SO CMB map
 s.\n\nhttps://events.ncbj.gov.pl/event/502/contributions/2263/
LOCATION:
URL:https://events.ncbj.gov.pl/event/502/contributions/2263/
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