Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations

被引：240

作者：

Lonardoni, Diego ^{[1
]}

Lovato, Alessandro ^{[1
]}

Gandolfi, Stefano ^{[2
]}

Pederiva, Francesco ^{[3
,4
]}

机构：

[1] Argonne Natl Lab, Div Phys, Lemont, IL 60439 USA

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[3] Univ Trento, Dept Phys, I-38123 Trento, Italy

[4] INFN TIFPA, I-38123 Trento, Italy

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 09期

关键词：

EQUATION-OF-STATE; NEUTRON-STARS; LAMBDA-HYPERNUCLEI; BINDING-ENERGIES; MAXIMUM MASS; MATTER; NUCLEI; PULSAR; CORES; BREAKING;

D O I：

10.1103/PhysRevLett.114.092301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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. 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.

引用

页数：5

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