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考虑非牛顿引力下的快速转动混合星性质
Properties of rapidly rotating hybrid stars with non-Newtonian gravity
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摘要: 计算和讨论了考虑非牛顿引力下的快速转动混合星结构与性质，包括质量．半径关系、Kepler转速、转动惯量、引力红移以及转动动能和引力结合能之比等．结果表明，转动将有效地增大混合星能支持的最大质量，Kepler转速下能支持的最大质量比静态时增加20％左右；转动对于考虑非牛顿引力的混合星整体结构性质（包括质量．半径关系、转动惯量、转动动能和引力结合能之比等）具有明显的影响，但对极向引力红移影响相对较小．Abstract: The properties of rapidly rotating hybrid stars are calculated and discussed with an equation of state considering non-Newtonian gravity (described by the Yukawa contribution). The said properties include the mass-radius relationship, the Kepler rotating frequency, the moment of inertia, the gravitational redshifl and the ratio of the rotational energy to the gravitational energy. It is shown that at the Kepler frequency, the maximum stellar mass increases up to about 20% compared with that from the static model at the same central density. It is also shown that for a rapidly rotating hybrid star, the rotation has an obvious influence on the bulk properties, such as the mass-radius relationship, the moment of inertia, the ratio of the rotational energy and gravitational energy, but has a faint effect on the polar gravitational redshift.
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