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SUMMARY:[online] Revisiting PBH Accretion\, Evaporation and Their Cosmolog
 ical Consequences
DTSTART;VALUE=DATE-TIME:20261108T093000Z
DTEND;VALUE=DATE-TIME:20261108T100000Z
DTSTAMP;VALUE=DATE-TIME:20261023T133154Z
UID:indico-contribution-2932@indico.itp.ac.cn
DESCRIPTION:Speakers: JITUMANI KALITA (Indian Institute of Technology Guwa
 hati)\nPrimordial black holes (PBHs) provide a unique probe of the early U
 niverse. Their cosmological evolution is governed by the competition betwe
 en mass accretion and Hawking evaporation. In this paper we look into the 
 details impact of accretion. Most of the earlier analysis relied on non-re
 lativistic accretion models. In this work\, we reinvestigate this in a ful
 ly relativistic framework for Kerr PBHs in the radiation-dominated era. We
  derive relativistic accretion rate and compute spin-dependent efficiency 
 $\\lambda_{\\rm Kerr}(a_*)$. Using this result\, we construct coupled evol
 ution equations for the PBH mass and spin that include both relativistic a
 ccretion and spin-dependent evaporation. Our analysis shows that relativis
 tic accretion significantly increases PBH masses and consequently suppress
 es their spins\, causing all PBHs to become effectively Schwarzschild well
  before evaporation. These effects strengthen the Big Bang Nucleosynthesis
  (BBN) bound on the initial PBH mass by a factor of $\\sim 4-5\,$ reduce t
 he mass required for survival to the present epoch to $\\sim 2.7 \\times 1
 0^{14} \\rm g\,$ and shift the viable particle like DM parameter space. No
 tably the early accretion induced spin-down effect further washes out the 
 well known high-frequency\, spin-induced feature in the high frequency sto
 chastic gravitational-wave background\, modifying predictions for future d
 etectors.\n\nhttps://indico.itp.ac.cn/event/417/contributions/2932/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2932/
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