Effects of the U boson on the inner edge of neutron star crusts

doi:10.1103/PhysRevD.85.043013

	Effects of the U boson on the inner edge of neutron star crusts
	Zheng, Hao 1; Chen, Lie-Wen 1,2
刊名	PHYSICAL REVIEW D
	2012-02-21
卷号	85
ISSN号	1550-7998
DOI	10.1103/PhysRevD.85.043013
文献子类	Article
英文摘要	We explore effects of the light vector U boson, which is weakly coupled to nucleons, on the transition density rho(t) and pressure P-t at the inner edge separating the liquid core from the solid crust of neutron stars. Three methods, i.e., the thermodynamical approach, the curvature matrix approach, and the Vlasov equation approach, are used to determine the transition density rho(t) with the Skyrme effective nucleon-nucleon interactions. We find that the rho(t) and P-t depend on not only the ratio of coupling strength to mass squared of the U boson g(2)/mu(2) but also its mass mu due to the finite-range interaction from the U-boson exchange. In particular, our results indicate that the rho(t) and P-t are sensitive to both g(2)/mu(2) and mu if the U-boson mass mu is larger than about 2 MeV. Furthermore, we show that both g(2)/mu(2) and mu can have significant influence on the mass-radius relation and the crustal fraction of total moment of inertia of neutron stars. In addition, we study the exchange term contribution of the U boson based on the density matrix expansion method, and demonstrate that the exchange term effects on the nuclear matter equation of state as well as the rho(t) and P-t are generally negligible.
资助项目	National Basic Research Program of China (973 Program)[2007CB815004]
WOS关键词	EQUATION-OF-STATE ; ASYMMETRIC NUCLEAR-MATTER ; DENSITY-MATRIX EXPANSION ; NON-NEWTONIAN GRAVITY ; HEAVY-ION REACTIONS ; INVERSE-SQUARE LAW ; KAON PRODUCTION ; CONSTRAINTS ; PHYSICS ; INCOMPRESSIBILITY
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000300570700003
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/48711]
专题	中国科学院近代物理研究所
通讯作者	Chen, Lie-Wen
作者单位	1.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China 2.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Hao,Chen, Lie-Wen. Effects of the U boson on the inner edge of neutron star crusts[J]. PHYSICAL REVIEW D,2012,85.
APA	Zheng, Hao,&Chen, Lie-Wen.(2012).Effects of the U boson on the inner edge of neutron star crusts.PHYSICAL REVIEW D,85.
MLA	Zheng, Hao,et al."Effects of the U boson on the inner edge of neutron star crusts".PHYSICAL REVIEW D 85(2012).