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DTSTART;TZID=America/Los_Angeles:20260116T120000
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SUMMARY:INPA Seminar Speaker: Ralf Konietzka (Harvard) - Title: Fast Radio Burst Cosmology in IllustrisTNG: Forward Modeling Dispersion Measures to Constrain Baryonic Feedback
DESCRIPTION:Date: January 16\, 2026 \nTime: 12:00 pm – 1:00 pm \nLocation: Sessler Conference Room – 50A-5132 [Hybrid and In-Person] \nSpeaker: Ralf Konietzka (Harvard) \nTitle: Fast Radio Burst Cosmology in IllustrisTNG: Forward Modeling Dispersion Measures to Constrain Baryonic Feedback \nAbstract: The dispersion measures (DMs) of Fast Radio Bursts (FRBs) arise predominantly from free electrons in the large-scale structure of the Universe. The increasing number of FRB observations have started to empirically constrain the distribution of cosmic baryons\, making it crucial to accurately forward model their propagation within cosmological simulations.\nIn this talk\, I present a method for measuring FRB DMs in IllustrisTNG that continuously traces rays through the simulation while reconstructing all traversed line segments within the underlying Voronoi mesh. Leveraging this technique\, we create over 20 publicly available DM catalogs\, including a full-sky DM map observed from a Milky Way-like environment.\nOur method addresses a problem in previous TNG-based studies\, in which a sparse snapshot sampling in the path integral leads to a misestimation of the standard deviation and higher moments of the DM distribution p(DM|z) by over 50%.\nConfronting our simulated FRB catalogs with recent observations from DSA-110\, ASKAP\, and CHIME\, I quantify the distribution of baryons relative to the underlying matter\, allowing us to place new constraints on the strength of baryonic feedback. \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/95016696011?pwd=Tk1XOW1Xd3RYRnlsc2tEYmRWZlVVZz09 \nMeeting ID: 950 1669 6011 \nPasscode: 247722
URL:https://inpa.lbl.gov/event/inpa-seminar-speaker-ralf-konietzka-harvard-title-tbd/
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