论文标题
纯中子物质中超流体间隙和临界温度的多体近似
Many-body approximations to the superfluid gap and critical temperature in pure neutron matter
论文作者
论文摘要
我们计算纯中子物质中的单线配对间隙和临界温度，具有不同的多体近似值。与标准BCS ANSATZ相比，中等影响往往会降低间隙和临界温度。在平均场近似值中，这两个量的比率在广泛的密度范围内保持恒定。该恒定比率与BCS理论的普遍预测接近，无论是否包括三中性相互作用。使用更复杂的多体方法，该方法结合了配对性能中短距离相关性的效果，我们发现低密度状态下的差距与临界温度比率大大大于BCS预测，而与交互无关。在该区域中，我们的结果相对接近于统一费米气体的实验和理论计算。我们还发现证据表明零温度间隙和中子物质中的临界温度的密度依赖性不同。
We compute singlet pairing gaps and critical temperatures in pure neutron matter with different many-body approximations. Medium effects tend to reduce gaps and critical temperatures compared to the standard BCS ansatz. In the mean-field approximation, the ratio of these two quantities remains constant across a wide range of densities. This constant ratio is close to the universal prediction of BCS theory, whether three-neutron interactions are included or not. Using a more sophisticated many-body approach that incorporates the effect of short-range correlations in pairing properties, we find that the gap to critical temperature ratio in the low-density regime is substantially larger than the BCS prediction, independently of the interaction. In this region, our results are relatively close to experiments and theoretical calculations from the unitary Fermi gas. We also find evidence for a different density dependence of zero-temperature gaps and critical temperatures in neutron matter.
