Electrically charged: An effective mechanism for soft EOS supporting massive neutron star  

作　　者：JING ZhenZhen WEN DeHua ZHANG XiangDong 

机构地区：[1]School of Sciences, South China University of Technology

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第10期100-106,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.10947023,11275073,and 11305063);the Fundamental Research Funds for the Central University of China(Grant Nos.2013ZG0036and 2013ZM107);University of China(Grant Nos.2013ZG0036 and2013ZM107)

摘　　要：The massive neutron star discoverer announced that strange particles, such as hyperons should be ruled out in the neutron star core as the soft Equation of State(EOS) can-not support a massive neutron star. However, many of the nuclear theories and laboratory experiments support that at high density the strange particles will appear and the corresponding EOS of super-dense matters will become soft. This situation promotes a challenge between the astro-observation and nuclear physics. In this work, we introduce an effective mechanism to answer this challenge, that is, if a neutron star is electrically charged, a soft EOS will be equivalently stiffened and thus can support a massive neutron star. By employing a representative soft EOS, it is found that in order to obtain an evident effect on the EOS and thus increasing the maximum stellar mass by the electrostatic field, the total net charge should be in an order of 1020 C. Moreover, by comparing the results of two kind of charge distributions, it is found that even for different distributions, a similar total charge:～2.3×1020C is needed to support a～2.0M⊙neutron star.The massive neutron star discoverer announced that strange particles, such as hyperons should be ruled out in the neutron star core as the soft Equation of State （EOS） can-not support a massive neutron star. However, many of the nuclear theories and laboratory experiments support that at high density the strange particles will appear and the corresponding EOS of super-dense matters will become soft. This situation promotes a challenge between the astro-observation and nuclear physics. In this work, we introduce an effective mechanism to answer this challenge, that is, if a neutron star is electrically charged, a soft EOS will be equivalently stiffened and thus can support a massive neutron star. By employing a representative soft EOS, it is found that in order to obtain an evident effect on the EOS and thus increasing the maximum stellar mass by the electrostatic field, the total net charge should be in an order of 1020 C. Moreover, by comparing the results of two kind of charge distributions, it is found that even for different distributions, a similar total charge： - 2.3 × 10^20 C is needed to support a - 2.0M⊙ neutron star.

关 键 词：neutron star equation of state electrical field 

分 类 号：P145.6[天文地球—天体物理]