NEUTRON STARS WITH SMALL RADII-THE ROLE OF Δ RESONANCES

被引：52

作者：

Schuerhoff, Torsten ^{[1
,2
]}

Schramm, Stefan ^{[1
,2
,3
]}

Dexheimer, Veronica ^{[4
]}

机构：

[1] Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany

[2] Goethe Univ, Inst Theoret Phys, D-60438 Frankfurt, Germany

[3] Goethe Univ Frankfurt, Ctr Comp Sci, D-60438 Frankfurt, Germany

[4] Gettysburg Coll, Gettysburg, PA 17325 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 724卷 / 01期

关键词：

binaries: general; stars: neutron; NUCLEAR; EQUATION; MATTER; STATE; MASS;

D O I：

10.1088/2041-8205/724/1/L74

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent neutron star observations suggest that the masses and radii of neutron stars may be smaller than previously considered, which would disfavor a purely nucleonic equation of state (EoS). In our model, we use a flavor SU(3) sigma model that includes Delta resonances and hyperons in the EoS. We find that if the coupling of the Delta resonances to the vector mesons is slightly smaller than that of the nucleons, we can reproduce both the measured mass-radius relationship and the extrapolated EoS.

引用

页码：L74 / L77

页数：4

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