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SUMMARY:Galactic and cosmological probes of dark matter self-interactions
DTSTART:20260723T070000Z
DTEND:20260723T083000Z
DTSTAMP:20260710T170800Z
UID:indico-event-420@indico.kias.re.kr
DESCRIPTION:Speakers: Boris Betancourt (IBS\, Daejon)\n\nTitle: Galactic a
 nd cosmological probes of dark matter self-interactions\nSpeaker: Boris Be
 tancourt\nAbstract:\nDark matter self-interactions can lead to number-chan
 ging processes that become especially important in regions of high dark ma
 tter density. In this talk\, I will discuss how such reactions shape both 
 the astrophysical distribution of dark matter and the observable signals t
 hey can produce. First\, I will show that multi-particle number-changing i
 nteractions can significantly deplete dark matter spikes at galactic cente
 rs\, particularly for the cross sections expected from thermal freeze-out\
 , while semi-annihilation can preserve spike structure in many cases. I wi
 ll then turn to the phenomenology of semi-annihilation as a source of boos
 ted dark matter\, focusing on fluxes generated in the Galactic Center and 
 on their detectability in direct detection and neutrino experiments. Final
 ly\, I will present a cosmological extension of this picture\, where semi-
 annihilation in the inhomogeneous early Universe produces a redshift-depen
 dent boosted dark matter flux that can enhance experimental sensitivity by
  orders of magnitude. Together\, these results show that number-changing d
 ark matter dynamics can leave complementary imprints in astrophysical stru
 cture\, direct searches\, and neutrino-based observations\, opening new op
 portunities to probe sub-GeV dark matter.\n\n\nhttps://indico.kias.re.kr/e
 vent/420/
LOCATION:Room 1423 (KIAS)
URL:https://indico.kias.re.kr/event/420/
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