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SUMMARY:[JC] Primordial Neutron Stars
DTSTART:20260625T060000Z
DTEND:20260625T070000Z
DTSTAMP:20260715T075300Z
UID:indico-event-1321@indico.ibs.re.kr
DESCRIPTION:Speakers: Sougata Ganguly\n\nIn this talk\, I will discuss the
  recent paper arXiv: 2604.08651\, where the authors investigate a plausib
 le mechanism for the formation of primordial neutron stars in the early u
 niverse\, prior to big bang nucleosynthesis.\n \nAuthors: Gordan Krnjaic
 \, Duncan Rocha\, and Huangyu Xiao\n \nAbstract of the paper: We propo
 se a novel cosmological scenario in which baryonic neutron stars could pla
 usibly form in the early universe. If baryogenesis initially produces an e
 xcessively large baryon asymmetry\, Y_B \\gg 1E-10 \, the baryonic mass in
 side the horizon can exceed the minimum neutron star mass before big bang 
 nucleosynthesis (BBN). While this large asymmetry is present\, non-relativ
 istic baryons can dominate the universe\, and enhanced density perturbatio
 ns on small scales can gravitationally collapse Hubble patches shortly aft
 er horizon re-entry. For some initial perturbations\, just below the thres
 hold for black hole formation\, this collapse will be arrested only by nuc
 lear pressure\, possibly resulting in neutron star formation. Afterwards\,
  there must be a large entropy injection to restore the observed baryon as
 ymmetry\, Y_B ∼ 1E-10\, and preserve the successful predictions of stand
 ard BBN. Unlike neutron stars that form from stellar collapse\, primordial
  neutron stars can\, in principle\, be as light as ∼ 0.1 M_\\odot\, limi
 ted only by the nuclear equation of state.\n \n\nhttps://indico.ibs.re.kr
 /event/1321/
LOCATION:CTPU seminar room (IBS)
URL:https://indico.ibs.re.kr/event/1321/
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