Differentially rotating scalarized neutron stars with realistic postmerger profiles

被引：4

作者：

Staykov, Kalin, V ^{[1
]}

Doneva, Daniela D. ^{[2
,3
]}

Heisenberg, Lavinia ^{[4
,5
,6
]}

Stergioulas, Nikolaos ^{[7
]}

Yazadjiev, Stoytcho S. ^{[1
,2
,8
]}

机构：

[1] Sofia Univ, Fac Phys, Dept Theoret Phys, Sofia 1164, Bulgaria

[2] Eberhard Karls Univ Tubingen, Theoret Astrophys, D-72076 Tubingen, Germany

[3] Bulgarian Acad Sci, INRNE, Sofia 1784, Bulgaria

[4] Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, Germany

[5] Inst Theoret Phys, ETH Zurich, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[6] Perimeter Inst, 31 Caroline St N, Waterloo, ON, Canada

[7] Aristotle Univ Thessaloniki, Dept Phys, Thessaloniki 54124, Greece

[8] Bulgarian Acad Sci, Inst Math & Informat, Academician G Bonchev St 8, Sofia 1113, Bulgaria

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 02期

关键词：

RELATIVISTIC STARS; GENERAL-RELATIVITY; THRESHOLD; SYMMETRY; REMNANTS; MODELS; TESTS; MASS;

D O I：

10.1103/PhysRevD.108.024058

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The merger remnant of a binary neutron star coalescence is initially strongly differentially rotating. Some properties of these remnants can be accurately modeled through building equilibrium neutron star models. In the present paper, we study how a modification of general relativity, namely scalar-tensor theory with a massive scalar field, will alter the picture. In contrast to previous studies, we implement a realistic phenomenological differential rotational law which allows for neutron star models to attain maximal angular velocity away from the center. We find that solutions with much higher masses and angular momenta exist in scalar-tensor theory compared with general relativity. They keep their quasispherical energy-density distribution for significantly higher values of the angular momentum before transitioning to quasitoroidal models, in contrast to pure general relativity. Constructing such neutron star solutions is the first step to our final goal that is studying how scalarization alters the stability and gravitational wave emission of postmerger remnants.

引用

页数：13

共 67 条

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