Small radii of neutron stars as an indication of novel in-medium effects

Small radii of neutron stars as an indication of novel in-medium effects
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中子星的小半径表明了新的介质效应

DOI:
10.1140/epja/i2015-15119-7
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发表时间:
2015-09
期刊:
Eur. Phys. J. A
影响因子:
--
通讯作者:
F.J. Fattoyev
F.J. Fattoyev
中科院分区:
其他
文献类型:
--
作者:
Wei-Zhou Jiang;Bao-An Li;F.J. Fattoyev

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目前,中子星星半径的观测和模型预测仍然非常不确定。虽然不同的模型可以预测中子星星的半径范围很广,但大多数模型都不可能预测小于10公里的半径,因此,如果将来建立这样小的半径,它们将很难与模型估计值相一致。通过在状态方程中引入一个新的项来提高能量密度,但保持压力不变,我们模拟了当前中子星星半径的不确定性。这个新项可能是由于弱相互作用轻U玻色子与适当的介质参数的交换,这并不影响传统核模型的成功。这个新方案的有效性最终将通过更精确的中子星星半径测量来检验。
At present, neutron star radii from both observations and model predictions remain very uncertain. Whereas different models can predict a wide range of neutron star radii, it is not possible for most models to predict radii that are smaller than about 10km, thus if such small radii are established in the future they will be very difficult to reconcile with model estimates. By invoking a new term in the equation of state that enhances the energy density, but leaves the pressure unchanged we simulate the current uncertainty in the neutron star radii. This new term can be possibly due to the exchange of the weakly interacting light U-boson with appropriate in-medium parameters, which does not compromise the success of the conventional nuclear models. The validity of this new scheme will be tested eventually by more precise measurements of neutron star radii.
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影响因子: 3.1
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