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SUMMARY:Magnification bias for cross-correlation of CMB lensing and galaxy
  clustering in LSST
DTSTART;VALUE=DATE-TIME:20261019T093000Z
DTEND;VALUE=DATE-TIME:20261019T094500Z
DTSTAMP;VALUE=DATE-TIME:20261112T103450Z
UID:indico-contribution-2251@events.ncbj.gov.pl
DESCRIPTION:Speakers: Nicola Principi Cavaterra (NCBJ)\nCosmology is curre
 ntly in a period of rapid development. During the past decade\, increasing
  observational evidence has led to the establishment of the LCDM model. De
 spite its success\, the latter has recently been challenged by several ten
 sions. The combination of galaxy surveys and CMB lensing is a powerful pro
 be of the large-scale structure and a key tool for testing the standard co
 smological model in the era of next-generation experiments. Upcoming galax
 y surveys such as the Legacy Survey of Space and Time (LSST)\, together wi
 th CMB experiments such as the Simons Observatory (SO) and LiteBIRD\, will
  dramatically improve the volume of the available data. On the on the othe
 r hand\, such surveys will also require careful control of increasingly im
 portant observational systematics. One important effect is magnification b
 ias\, arising from lensing-induced fluctuations in observed galaxy number 
 counts. While previous studies focused on low redshift galaxy clustering a
 nd clustering-shear cross-correlations\, I will show that magnification bi
 as grows dramatically for the higher redhsifts probed by LSST. In particul
 ar\, I will present studies of the effect on the CMB lensing-galaxy cluste
 ring cross-correlation following a novel tomographic approach. Understandi
 ng and mitigating magnification bias will be crucial to fully exploit LSST
  data\, and to shed light on the unresolved cosmological tensions.\n\nhttp
 s://events.ncbj.gov.pl/event/502/contributions/2251/
LOCATION:
URL:https://events.ncbj.gov.pl/event/502/contributions/2251/
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