BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Dynamical Simulations of Self-Consistent Mass Accretion onto Black Holes in Ultralight Dark Matter DTSTART;VALUE=DATE-TIME:20261028T181800Z DTEND;VALUE=DATE-TIME:20261028T181900Z DTSTAMP;VALUE=DATE-TIME:20261023T011125Z UID:indico-contribution-3706@nyx.physics.mcgill.ca DESCRIPTION:Speakers: Yourong Frank Wang (University of Göttingen)\nDark matter may be made of ultra-light bosonic particles\, so light that it beh aves like a large-scale quantum wave rather than a swarm of individual par ticles ("ultralight" or "fuzzy" dark matter). This wave nature changes how massive objects like black holes move through it: the drag that normally causes objects to sink toward a galaxy's center can behave very differentl y.\n\nPrior work on a black hole moving through this kind of dark matter f ound strikingly different outcomes depending on the environment. Embedded in the dense\, wave-supported core at a galaxy's center\, the black hole d oesn't simply sink\; its orbit oscillates in a "stone-skipping" pattern as it repeatedly disturbs and rebounds off the vibrating core (Zhang\, Wang\ , Zagorac & Easther 2026). In a smoother\, more uniform environment\, our own preliminary work instead finds enhanced dynamical friction due to the formation of a dense gravitational wake.\n\nSuch prior work was based on d ynamical simulations where we held the black hole's mass fixed\, which whi le arguably a small effect\, still isn’t complete given the vast timesca les of a cosmological simulation. We add the missing piece: a black hole s hould also grow by swallowing the surrounding dark matter as it moves. We implement a physically calibrated accretion prescription\, matched to the classical accretion rate used throughout astrophysics for objects moving t hrough gas. The new tool also gives the black hole a physical momentum ki ck from the infalling matter\, not just added mass. We present early resul ts on how this self-consistent growth changes the dynamics in both environ ments considered before.\n\nhttps://nyx.physics.mcgill.ca/event/587/contri butions/3706/ LOCATION:Online URL:https://nyx.physics.mcgill.ca/event/587/contributions/3706/ END:VEVENT END:VCALENDAR