Open AccessThe effect of change in entropy on primordial nucleosynthesis
Author(s) -
Vlad Yu. Yurchenko,
A. V. Ivanchik
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1697/1/012028
Subject(s) - physics , thermalisation , nucleosynthesis , annihilation , photon , axion , big bang nucleosynthesis , universe , electron , astrophysics , entropy (arrow of time) , thermal , cosmology , particle physics , nuclear physics , dark matter , atomic physics , stars , quantum mechanics , thermodynamics
One of the most important features of the Universe in studies of evolution of the early Universe is conservation of entropy of particles being in thermal contact with each other in comoving volume. Destruction of any particles (for example, annihilation of electrons and positrons) or thermalization processes lead to transfer or sharing of entropy. In this paper hypothetical process of occurrence of thermal contact between photons and axions in the early Universe is considered to examine the effect of the process on yields of D, 4 He and 7 Li in Primordial Nucleosynthesis. It is found that change in photon entropy caused by thermalization of photons and axions lead to stronger overlapping between the intervals of acceptable values of η for 4 He and 7 Li. At the same time interval of acceptable values of η for D/H is shifted in opposite direction relatively to 4 He.