BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Stellar feedback on the largest & smallest scales: From the first 
 star-forming halos\, to the first self-consistent multidimensional simulat
 ions of Lyman-α feedback
DTSTART:20260603T120000Z
DTEND:20260603T130000Z
DTSTAMP:20260528T221200Z
UID:indico-event-9520@indico.fysik.su.se
DESCRIPTION:Speakers: Olof Petter Nils Axel Nebrin (Stockholm University)\
 n\nObservations of the high-redshift Universe\, and local faint and ancien
 t fossils from that epoch\, reveal that star formation at Cosmic Dawn coul
 d be both efficient and highly inefficient. Stellar feedback from massive 
 stars is thought to shape the fate of star-forming clouds\, launch galacti
 c winds\, and regulate star cluster formation. A key goal of simulations i
 s to reproduce the observed diversity of objects and star formation effici
 encies from first principles\, which demands careful studies of the stella
 r feedback processes at play.\nIn this seminar\, I will present the main r
 esults of my PhD project on star and galaxy formation at Cosmic Dawn. I wi
 ll begin by giving a brief overview of my work on when and where the first
  stars and galaxies formed. I will show how large-scale reionization turne
 d the Universe hostile to star formation in the smallest dark matter halos
 .\nNext\, I will focus on what happens on smaller scales when star formati
 on commences. What feedback processes are at play? It has long been suspec
 ted that radiation pressure from scattering Lyman-α (Lyα) photons could 
 exert a dominant force in dust-poor environments. Despite this\, multidime
 nsional\, self-consistent Lyα radiation hydrodynamics simulations have be
 en computationally infeasible. I will present the first such simulations\,
  using a novel code called LYDION.\nWith LYDION\, we simulate the feedback
  around massive stars in dust-poor clouds and find that Lyα radiation pre
 ssure dominates over all other feedback channels in these environments\, l
 aunching significantly stronger outflows. As a result\, most current galax
 y and star formation simulations may be missing the strongest feedback pro
 cess at play in young dust-poor star-forming regions at Cosmic Dawn\, comp
 licating comparisons against observations from JWST.\n\nhttps://indico.fys
 ik.su.se/event/9520/
LOCATION:Albano 3: 4205 - SU Conference Room (40 seats) (Albano Building 3
 )
URL:https://indico.fysik.su.se/event/9520/
END:VEVENT
END:VCALENDAR