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DTSTART;TZID=America/Los_Angeles:20171005T160000
DTEND;TZID=America/Los_Angeles:20171005T170000
DTSTAMP:20260419T052231
CREATED:20171002T085928Z
LAST-MODIFIED:20171002T085928Z
UID:652-1507219200-1507222800@rpm.physics.lbl.gov
SUMMARY:Simeon Bird (JHU) "Strong Absorbers in the Lyman-alpha Forest and Primordial Black Holes"
DESCRIPTION:Abstract:\nStrong HI absorbers are essentially the largest foreground contamination for Lyman alpha forest surveys\, and so a better understanding of them is necessary for achieving the goals of future Lyman alpha cosmology surveys. I will talk about a new automated technique for generating a probabilistic catalogue of strong absorbers for the entire survey\, allowing more robust cleaning of the foreground. Since no technique can entirely remove strong absorbers\, I will discuss new templates for characterising their effect on the flux power spectrum. A secondary systematic is induced by interpolation error between theoretical models\, and I will discuss techniques to mitigate this error with refining Gaussian Process emulators. Lastly I will discuss the interesting possibility that the surprisingly common mergers of ~30 solar mass black holes observed by LIGO could be primordial black hole dark matter\, which is intriguingly (still) not convincingly ruled out.
URL:https://rpm.physics.lbl.gov/event/simeon-bird-jhu-strong-absorbers-in-the-lyman-alpha-forest-and-primordial-black-holes/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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