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Spontaneous magnetization of solid quark-cluster stars
Lai, Xiao-Yu1,2; Xu, Ren-Xin3,4
Source PublicationCHINESE PHYSICS C
Contribution Rank2

Pulsar-like compact stars usually have strong magnetic fields, with strengths from similar to 10(8) to similar to 10(12) G on the surface. How such strong magnetic fields can be generated and maintained is still an unsolved problem, which is, in principle, related to the interior structure of compact stars, i.e., the equation of state of cold matter at supra-nuclear density. In this paper we are trying to solve the problem in the regime of solid quark-cluster stars. Inside quark-cluster stars, the extremely low ratio of number density of electrons to that of baryons n(e)/n(b) and the screening effect from quark-clusters could reduce the long-range Coulomb interaction between electrons to short-range interaction. In this case, Stoner's model could apply, and we find that the condition for ferromagnetism is consistent with that for the validity of Stoner's model. Under the screened Coulomb repulsion, the electrons inside the stars could be spontaneously magnetized and become ferromagnetic, and hence would contribute non-zero net magnetic momentum to the whole star. We conclude that, for most cases in solid quark-cluster stars, the amount of net magnetic momentum, which is proportional to the amount of unbalanced spins xi = (n(+) - n(-))/n(e) and depends on the number density of electrons n(e) = n(+) + n(-), could be significant with non-zero xi. The net magnetic moments of electron system in solid quark-cluster stars could be large enough to induce the observed magnetic fields for pulsars with B similar to 10(11) to similar to 10(13) G.

Correspondent Emaillaixy@pku.edu.cn
KeywordPulsars Strange Stars Magnetic Fields
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordNeutron-stars ; Matter ; Model
WOS Research AreaPhysics
WOS SubjectPhysics, Nuclear ; Physics, Particles & Fields
WOS IDWOS:000383367200012
Funding Organization973 Program(2012CB821801) ; West Light Foundation(XBBS-2014-23) ; National Natural Science Foundation of China(11203018 ; Science Project of Universities in Xinjiang(XJEDU2012S02) ; Doctoral Science Foundation of Xinjiang University(B5120107) ; 11225314 ; 11365022)
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLai, Xiao-Yu
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
2.Xinjiang Univ, Sch Phys, Urumqi 830046, Peoples R China
3.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Lai, Xiao-Yu,Xu, Ren-Xin. Spontaneous magnetization of solid quark-cluster stars[J]. CHINESE PHYSICS C,2016,40(9):095102.
APA Lai, Xiao-Yu,&Xu, Ren-Xin.(2016).Spontaneous magnetization of solid quark-cluster stars.CHINESE PHYSICS C,40(9),095102.
MLA Lai, Xiao-Yu,et al."Spontaneous magnetization of solid quark-cluster stars".CHINESE PHYSICS C 40.9(2016):095102.
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