Neutron stars in a perturbative f(R) gravity model with strong magnetic fields

被引：36

作者：

Cheoun, Myung-Ki ^{[1
]}

Deliduman, Cemsinan ^{[2
]}

Gungor, Can ^{[3
]}

Keles, Vildan ^{[3
]}

Ryu, C. Y. ^{[4
]}

Kajino, Toshitaka ^{[5
,6
]}

Mathews, Grant J. ^{[5
,7
]}

机构：

[1] Soongsil Univ, Dept Phys, Seoul 156743, South Korea

[2] Mimar Sinan Fine Arts Univ, Dept Phys, TR-34380 Istanbul, Turkey

[3] Istanbul Tech Univ, Fac Sci & Letters, Dept Engn Phys, TR-34469 Istanbul, Turkey

[4] Hanyang Univ, Gen Educ Curriculum Ctr, Seoul 133791, South Korea

[5] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[6] Univ Tokyo, Dept Astron, Grad Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan

[7] Univ Notre Dame, Ctr Astrophys, Dept Phys, Notre Dame, IN 46556 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2013年 / 10期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

modified gravity; magnetic fields; neutron stars; massive stars; GAMMA-RAY REPEATERS; X-RAY; MATTER; EQUATION; RADIUS; STATE; MASS;

D O I：

10.1088/1475-7516/2013/10/021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In Kaluza-Klein electromagnetism it is natural to associate modified gravity with strong electromagnetic fields. Hence, in this paper we investigate the combined effects of a strong magnetic field and perturbative f(R) gravity on the structure of neutron stars. The effect of an interior strong magnetic field of about 10(17-18) G on the equation of state is derived in the context of a quantum hadrodynamics (QHD) equation of state (EoS) including effects of the magnetic pressure and energy along with occupied Landau levels. Adopting a random orientation of interior field domains, we solve the modified spherically symmetric hydrostatic equilibrium equations derived for a gravity model with f(R) = R + alpha R-2. Effects of both the finite magnetic field and the modified gravity are detailed for various values of the magnetic field and the perturbation parameter a along with a discussion of their physical implications. We show that there exists a parameter space of the modified gravity and the magnetic field strength, in which even a soft equation of state can accommodate a large (>2 M-circle dot) maximum neutron star mass.

引用

页数：16

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