BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Can one see the mass of a PBH?
DTSTART:20260720T070000Z
DTEND:20260720T083000Z
DTSTAMP:20260804T000600Z
UID:indico-event-427@indico.kias.re.kr
DESCRIPTION:Speakers: Tae-Geun Kim (Fudan University)\n\nTitle: Can one se
 e the mass of a PBH?\nSpeaker: Tae-Geun Kim\nAbstract:\nPrimordial black h
 oles (PBHs) are compact objects hypothesized to form in the early universe
  from large primordial energy-density fluctuations. Interacting essentiall
 y only through gravity\, and able to survive from the early universe to th
 e present when heavier than roughly $5\\times10^{14}\,\\mathrm{g}$\, they 
 remain a viable candidate for dark matter. A PBH emits Hawking radiation\,
  producing thermally every particle species whose rest mass lies below its
  Hawking temperature\, and the resulting photon spectrum offers one of the
  most direct observational windows onto the PBH abundance and mass functio
 n.Most existing analyses\, however\, proceed parametrically: a specific fu
 nctional form is assumed for the mass distribution\, the corresponding spe
 ctrum is computed over a grid of parameters\, and the parameter space is t
 hen constrained against observations through exclusion limits or Bayesian 
 inference. This ties the conclusions to the assumed family of mass functio
 ns.We step outside this parametric paradigm. Using a neural operator\, we 
 construct an amortized inverse map that\, given a photon spectrum attribut
 ed to PBH evaporation\, directly reconstructs a plausible mass function wi
 thout assuming any functional form. Going further\, we characterize the fu
 ll ensemble of mass functions that yield a statistically indistinguishable
  spectrum\, thereby exposing the intrinsic degeneracy\, the physical infor
 mation ceiling\, of the inverse problem. The result is a geometry-aware\, 
 calibrated uncertainty quantification that distinguishes what a photon spe
 ctrum can in principle reveal about a PBH's mass from what it fundamentall
 y cannot.\nParticle Physics is inviting you to a scheduled Zoom meeting.Jo
 in Zoom Meetinghttps://kias-re-kr.zoom.us/j/82455584208?pwd=7QhsWDeCw8ORa4
 W7pa58cT3jSxPgpg.1Meeting chat linkhttps://kias-re-kr.zoom.us/launch/jc/82
 455584208Meeting ID: 824 5558 4208Passcode: 972165\n\nhttps://indico.kias.
 re.kr/event/427/
LOCATION:Room 1423 (KIAS)
URL:https://indico.kias.re.kr/event/427/
END:VEVENT
END:VCALENDAR