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SUMMARY:Evolution of Anomalous Chemical Composition in Primordial High-Tem
 perature Regions Confined Within Domain Walls
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261029T094839Z
UID:indico-contribution-6453@cern.ch
DESCRIPTION:Speakers: Lazaro Arturo Ychaso Perez (MEPhI)\nThis study inves
 tigates thermonuclear nucleosynthesis within hypothetical hot primordial r
 egions of the early Universe\, which are separated from the Hubble expansi
 on and confined within domain walls. We present a numerical model simulati
 ng the evolution of nuclide concentrations at constant extreme temperature
 s exceeding 5 MeV. Under these conditions\, the confinement of neutrinos m
 akes weak interaction reactions reversible\, leading to rapid local thermo
 dynamic equilibrium and stabilizing both the temperature and the proton-to
 -neutron ratio. Our results demonstrate the formation of a unique\, anomal
 ous hydrogenless chemical composition\, as practically all free nucleons e
 fficiently bind into helium-4 (${}^4$He). Subsequently\, the saturation of
  the plasma with helium-4 triggers an intense\, explosive synthesis of car
 bon-12 (${}^{12}$C) via the triple-alpha process. Unlike standard stellar 
 nucleosynthesis\, this high-energy process is not solely dominated by the 
 Hoyle resonance and is instead accurately described by the generalized Cau
 ghlan-Fowler formula\, which accounts for highly excited states of the car
 bon nucleus. Finally\, the strict conservation of the total baryon number 
 throughout the calculations verifies the physical accuracy and stability o
 f the applied numerical methodology.\n\nhttps://indico.particle.mephi.ru/e
 vent/626/contributions/6453/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6453/
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