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SUMMARY:Beyond the Visible: Unveiling Galaxy-Galaxy Lenses and Dark Matter
  Scaling Relations Across Cosmic Scales
DTSTART:20260615T100000Z
DTEND:20260615T120000Z
DTSTAMP:20260618T120200Z
UID:indico-event-9367@scitalks.tifr.res.in
DESCRIPTION:Speakers: Gopika Kayanikunnath (IIT\, Hyderabad)\n\nThe curren
 t concordance (LCDM) cosmological model provides a robust framework for un
 derstanding large-scale structure\, yet it faces persistent challenges on 
 scales smaller than 1 Mpc. Discrepancies such as the core/cusp and missing
  satellite problems\, along with enigmatic galactic scaling relations like
  the Radial Acceleration Relation (RAR)\, suggest that our understanding o
 f dark matter remains incomplete. This talk explores the nature of dark ma
 tter across cosmic scales\, from individual galaxies to massive clusters.\
 nThe first part of this work focuses on observational tests of the LCDM p
 aradigm. By analyzing the constancy of dark matter halo surface density an
 d the RAR within galaxy groups and clusters\, we compare empirical data ag
 ainst multi-wavelength mock catalogs. \nThe second part of the presentati
 on transitions to the next frontier of digital sky surveys: the applicatio
 n of deep learning to uncover hidden gravitational lenses. We detail a mac
 hine-learning-driven search for galaxy-galaxy strong lenses in the infrare
 d sky\, which has been tailored to identify rare red-red lenses at high re
 dshifts. These systems serve as powerful natural telescopes\, offering a u
 nique pathway to probe the fainter quiescent galaxies at the higher redshi
 fts. By bridging small-scale observational constraints with deep learning\
 , this research provides new insights into the fundamental properties of t
 he invisible universe.\n\nhttps://scitalks.tifr.res.in/event/9367/
URL:https://scitalks.tifr.res.in/event/9367/
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