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arXiv 1407.4448nucl-thastro-ph.SR
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Hyperon Puzzle:量子蒙特卡罗计算的启示

Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations

Diego Lonardoni, Alessandro Lovato, Stefano Gandolfi, Francesco Pederiva

摘要:

在中子星的核中超子的产生和随之而来的状态方程的软化一直受到质疑。有争议的理论预测和最近对中子星的天体物理观测是所谓超子之谜的基础。用辅助场扩散蒙特卡罗方法计算了中子和$Λ$粒子无限大系统的物态方程和中子星质量半径关系。我们发现,三体超子-核子相互作用在软化状态方程和降低预测的最大质量中起着重要的作用。我们考虑了两种不同的三体力模型,它们成功地描述了中等质量超核的结合能。我们的结果表明,它们对中子星的最大质量给出了截然不同的结果,这与最近对超大质量中子星的观测并不一定不一致。我们的结论是,为了正确评估超子在中子星中的作用,对超子-中子力的更强的约束是必要的。

英文摘要:

The onset of hyperons in the core of neutron stars and the consequent softening of the equation of state have been questioned for a long time. Controversial theoretical predictions and recent astrophysical observations of neutron stars are the grounds for the so-called hyperon puzzle. We calculate the equation of state and the neutron star mass-radius relation of an infinite systems of neutrons and $Λ$ particles by using the auxiliary field diffusion Monte Carlo algorithm. We find that the three-body hyperon-nucleon interaction plays a fundamental role in the softening of the equation of state and for the consequent reduction of the predicted maximum mass. We have considered two different models of three-body force that successfully describe the binding energy of medium mass hypernuclei. Our results indicate that they give dramatically different results on the maximum mass of neutron stars, not necessarily incompatible with the recent observation of very massive neutron stars. We conclude that stronger constraints on the hyperon-neutron force are necessary in order to properly assess the role of hyperons in neutron stars.

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