BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Direct surface-based simulation of primordial black hole clusters 
 formation via collapse of non-spherical domain walls
DTSTART;VALUE=DATE-TIME:20261029T071500Z
DTEND;VALUE=DATE-TIME:20261029T073000Z
DTSTAMP;VALUE=DATE-TIME:20261029T032156Z
UID:indico-contribution-6253@cern.ch
DESCRIPTION:Speakers: Ivan Letyagin (MEPhI)\nOne possible mechanism for th
 e formation of primordial black holes (PBHs) \nis the collapse of domain w
 alls. Previous theoretical models considered PBH \nformation in the spheri
 cal approximation\, whereas full field-theoretic \nsimulations of non-sphe
 rical domain walls clusters are too computationally \ndemanding to accumul
 ate sufficient statistics.\n\nIn this work\, we derive the equations of mo
 tion of a domain wall in the \nthin-wall approximation and propose a numer
 ical method for evolving the \nwall surface using triangular mesh algorith
 ms. For prescribed field configurations of a cluster\,  the method yields 
 the differential mass spectrum of the resulting PBHs.\n\nBased on a Monte 
 Carlo ensemble\, we obtain $dN/dM \\propto M^{-\\alpha}$ \nwith $\\alpha =
  2.31^{+0.01}_{-0.02}$\, significantly larger than the \ntheoretical value
  $\\alpha \\approx 1.75$ for spherical-wall collapse\, \nindicating a larg
 er fraction of low-mass PBHs. This deviation is \npresumably due to the fr
 agmentation of walls with complex geometry\, which is absent \nin the sphe
 rical approximation.\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6253/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6253/
END:VEVENT
END:VCALENDAR