https://doi.org/10.1140/epja/s10050-022-00721-x
Regular Article - Theoretical Physics
The influence of entropy and neutrinos on the properties of protoneutron stars
1
College of Electronic Information and Electrical Engineering, Chengdu University, 610106, Chengdu, China
2
School of Astronomy and Space Science, Nanjing University, 210023, Nanjing, China
3
Physics and Space Science College, China West Normal University, 637009, Nanchong, China
4
School of Mathematics and Physics, University of South China, 421001, Hengyang, China
Received:
4
January
2022
Accepted:
1
April
2022
Published online:
26
April
2022
A neutron star is formed by the evolution of a protoneutron star, so the study of the properties of protoneutron stars can help in understanding the structure and composition of neutron stars. The mass and radius of a cold neutron star calculated by the selected parameters are consistent with various existing astronomical observations. This set of parameters is then extrapolated to study the properties of a protoneutron star. This paper considers the isentropic protoneutron star matter with hyperons to study the temperature, composition, and oscillation under different conditions. Entropy promotes the production of hyperons, while neutrinos inhibit it. The maximum mass increases as the entropy and neutrino proportion increase. The temperature and radius increase with entropy, while the radius decreases as the neutrino proportion increases. The linear relationship between the frequency and average density of the protoneutron star and temperature is fitted, which is important for future observations.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022
