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SUMMARY:The golden era of weak gravitational lensing: from pixel to cosmol
 ogy\, from dark matter cartography to galaxy cluster detection and beyond
DTSTART:20260317T100000Z
DTEND:20260317T110000Z
DTSTAMP:20260515T044800Z
UID:indico-event-132@indico.iap.fr
DESCRIPTION:Speakers: Gavin Leroy (Durham University)\n\nGravitational len
 sing is a phenomenon ingrained in the laws of gravity\, providing a direct
  route to mapping the distribution of matter (dark and visible) across cos
 mic scales. Upcoming surveys\, such as Euclid\, Rubin LSST\, and Roman\, w
 ill\, for the first time\, map weak gravitational lensing over the entire 
 sky from billions of sources. Simultaneously\, instruments such as JWST al
 ready observe the sky with unprecedented resolution and galaxy density. Th
 is unprecedented volume of data opens a noteworthy window for detecting ga
 laxy clusters uniquely through their weak lensing signal\, motivating the 
 development of new methods to analyse data faster and control their system
 atics more efficiently. \nThis talk will discuss key aspects of weak lens
 ing\, starting at the level of the pixels\, with the control of the system
 atics (Charge Transfer Inefficiency) to ensure accurate weak lensing measu
 rements\, and ending at the level of the largest structures in the univers
 e\, galaxy clusters. Through this journey\, we will present state-of-the-a
 rt methods assembled for the first time to produce the highest resolution 
 dark matter cartography with JWST. As we move from JWST to Euclid\, we wil
 l introduce a new multi-scale galaxy cluster detection algorithm based on 
 the wavelet transform. In particular\, we will demonstrate its performance
  in the context of the galaxy cluster detection challenge within the Eucli
 d Consortium.  This framework is paving the way for cluster samples as cl
 ose as possible to being selected by total matter content.\n\nhttps://indi
 co.iap.fr/event/132/
LOCATION:Salle des séminaires (IAP)
URL:https://indico.iap.fr/event/132/
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