袋模型下奇异星的非牛顿引力效应

Non-Newtonian gravity in MIT strange quark stars

该文研究标准袋模型奇异星在考虑非牛顿引力效应下的结构和性质.文章结果显示,对于标准袋模型描述的奇异物质,随着重子数密度的增大,非牛顿引力效应的修正项能量密度越大;非牛顿引力效应的引入使物态变硬,而且较大的非牛顿引力参数g^(2)/μ^(2)对应较硬的物态方程;非牛顿引力效应的引入有效地增大了星体能支撑的最大质量并且当非牛顿引力参数g^(2)/μ^(2)≥1.93 GeV^(-2)时能够解释目前观测到的最大质量脉冲星(PSR J0470+6620)的数据.

The effects of non-Newtonian gravity on the properties of strange quark stars is investigated with MIT bag model.It is shown that the non-Newtonian contributed energy density increases with increasing baryon density.It is also found that,for the standard MIT bag model of strange quark matter,the inclusion of non-Newtonian gravity leads to stiffer EOSs with bigger parameters g^(2)/μ^(2) and higher maximum masses of compact stars,when non-Newtonian gravity parameters is bigger than 1.93 GeV^(-2).