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SUMMARY:Fundamental physics with quadruple image quasars
DTSTART:20260609T090000Z
DTEND:20260609T100000Z
DTSTAMP:20260515T044100Z
UID:indico-event-171@indico.iap.fr
DESCRIPTION:Speakers: Daniel Gilman (University of Chicago)\n\nThe propert
 ies of dark matter halos depend on the dark matter particle mass\, formati
 on mechanism\, and possible self-interactions\, enabling tests of fundamen
 tal physics through measurements of halo properties. JWST has recently sur
 veyed a sample of 31 quadruply imaged quasars\, measuring the relative mag
 nifications among the lensed images from the compact warm dust region surr
 ounding the background quasar. These data probe dark matter halo populatio
 ns down to 10^6 solar masses\, a regime where halos are too small to retai
 n stars and emit light. I will present the first inferences on the free-st
 reaming length of dark matter and subhalo abundance from the complete JWST
  lensed quasar dark matter survey. These analyses apply state-of-the-art l
 ens modeling and analysis techniques to the largest sample of strong lense
 s ever assembled for a dark matter inference\, yielding the most robust bo
 und on the free-streaming length of dark matter\, and the most precise mea
 surement of subhalo abundance to date. I will also discuss applications of
  strong lensing to other theories\, such as self-interacting dark matter\,
  in which low-mass halos are predicted to undergo core collapse and become
  extremely dense\, extremely efficient lenses. I will conclude by discussi
 ng how large surveys\, such as Euclid\, Roman\, and Rubin\, will discover 
 thousands of new strong lens systems\, enabling transformative dark matter
  science through strong lensing in the coming decade. \n\nhttps://indico.
 iap.fr/event/171/
LOCATION:Salle des séminaires
URL:https://indico.iap.fr/event/171/
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