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SUMMARY:Djuna Croon:  Probing dark matter and cosmology using gravitationa
 l microlensing
DTSTART:20260331T111500Z
DTEND:20260331T120000Z
DTSTAMP:20260404T151500Z
UID:indico-event-9531@indico.fysik.su.se
CONTACT:alexander.burgman@fysik.su.se\;azadeh.fattahi@fysik.su.se
DESCRIPTION:A key route to identifying the nature of dark matter is to tes
 t its predicted structure on sub-galactic scales\, where different models 
 diverge most strongly. Well-motivated scenarios predict that a fraction of
  the dark matter may reside in bound objects\, ranging from primordial bla
 ck holes to extended clumps arising in particle dark matter scenarios. Gra
 vitational microlensing — the transient magnification of background sour
 ces — provides a direct method to detect and characterise these otherwis
 e invisible mass concentrations. It can encode information about the mass\
 , abundance\, and spatial distribution of these structures.\nIn this talk\
 , I will review how microlensing constraints already limit several dark ma
 tter scenarios and discuss the characteristic signatures expected for exte
 nded lenses. Forthcoming time-domain surveys offer a new opportunity to se
 arch for these signatures and motivate the development of new data driven 
 methods to identify rare events. In addition\, I will highlight the emergi
 ng role of microlensing in the high-magnification regions of strong gravit
 ational lenses\, which enables sensitivity to less concentrated structures
 . Interestingly\, these measurements have novel implications for early Uni
 verse physics.\nAbout the speaker:  Djuna Croon is an associate professor
  at Durham University\, working at the interface of cosmology and astro-pa
 rticle physics. Her research focuses on using gravitational probes of dark
  matter and cosmology\, aiming to connect astronomical observations with f
 undamental physics beyond the Standard Model.\nIn the OKC:  Tuesday March
  31st\, in the CoPS A5 corridor \n\nhttps://indico.fysik.su.se/event/9531
 /
LOCATION:FD5 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9531/
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