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DTSTART;TZID=Europe/Paris:20251008T110000
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DTSTAMP:20260510T075306
CREATED:20250915T083255Z
LAST-MODIFIED:20251001T090705Z
UID:8126-1759921200-1759924800@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Jenny Wagner (Helsinki Institute of Physics)
DESCRIPTION:Title: From cosmic lasagna to space-time spaghetti — obtaining the least-model-dependent strong gravitational lensing probe \n \nAbstract: Strong gravitational lensing has advanced as a standard probe to map mass densities of cosmic structures or to try and infer parameters of the cosmological concordance model\, like the Hubble Constant.\nIn this talk\, I will introduce those properties of a light-deflecting cosmic structure that can be uniquely and directly determined from observables without any lens model assumptions. These properties constitute the maximum information common to all model-based mass maps and require less than a second of computing time [1]. The derivation of these characteristics also reveals the most general class of lensing degeneracies and a simple physical interpretation of their origins [2]. \nI will showcase the power of this approach in two galaxy clusters: we can infer a least-model-dependent smoothness scale for dark matter\, reconstruct the morphology of the lensed source galaxy\, and even infer global properties of the lensing cluster in combination with complementary data [3\,4]. Thus\, with an increasing amount of data\, this approach will allow us to gain a deeper understanding of the _necessary_ amount and properties of dark matter in cosmic structures. \nReferences:\n[1] https://arxiv.org/abs/1906.05285\n[2] https://arxiv.org/abs/1809.03505\, https://arxiv.org/abs/1904.07239\, https://arxiv.org/abs/2203.06190\n[3] https://arxiv.org/abs/2105.04562\, https://arxiv.org/abs/2207.01630\n[4] https://arxiv.org/abs/2306.11779
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-jenny-wagner-tbc/
LOCATION:Observatoire
ATTACH;FMTTYPE=image/png:https://cral.osu-lyon.fr/wp-content/uploads/2023/11/image_defaut.png
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