Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star

doi:10.1016/j.physletb.2009.11.007

	Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star
	Shao, Guo-yun 1,2; Liu, Yu-xin 1,2,3
刊名	PHYSICS LETTERS B
	2009-11-30
卷号	682 页码:171-176
关键词	Low mass X-ray binary (LMXB) Antikaon condensate
ISSN号	0370-2693
DOI	10.1016/j.physletb.2009.11.007
英文摘要	We reanalyze the observation data of X-ray burst of the X-ray binary EXO 0748-676 with the maximum measurement errors for the originally assigned redshift z = 0.35 and the latter modified z = 0.24. The newly obtained properties of the star are M >= 1.91(-0.33)(+0.40) M(circle dot) and R >= 12.47(-2.15)(+2.64) km for z = 0.35, slightly different from the previous result, and M >= 1.48(-0.26)(+0.31) M(circle dot) and R >= 12.47(-2.15)(+2.63) km for z = 0.24. The neutron star Mass obtained with z = 0.24 is more consistent with the result M = 1.35 M(circle dot) given by a detailed multiwavelength analysis. With this result, it is insufficient to rule out soft equations of state of nuclear matter, including those with the appearance of exotic matter. Furthermore, as an example, we show that the exotic composition of the matter in neutron star including antikaon condensation and hyperons can yield an maximum mass about M = 1.66 M(circle dot). This is consistent with the mass of EXO 0748676 with uncertainty in 1 sigma. (C) 2009 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[10425521] ; National Natural Science Foundation of China[10675007] ; Major State Basic Research Development Program[G2007CB815000]
WOS关键词	DYSON-SCHWINGER EQUATIONS ; X-RAY BURST ; DENSE QUARK MATTER ; KAON CONDENSATION ; SPECTRA ; QCD ; EVOLUTION ; PHYSICS ; EXO-0748-676 ; CONFINEMENT
WOS研究方向	Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000272607400002
资助机构	National Natural Science Foundation of China ; Major State Basic Research Development Program
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/30502]
专题	中国科学院近代物理研究所
通讯作者	Shao, Guo-yun
作者单位	1.Peking Univ, Dept Phys, Beijing 100871, Peoples R China 2.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China 3.Ctr Theoret Nucl Phys, Natl Lab Heavy Ion Accelerator, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Shao, Guo-yun,Liu, Yu-xin. Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star[J]. PHYSICS LETTERS B,2009,682:171-176.
APA	Shao, Guo-yun,&Liu, Yu-xin.(2009).Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star.PHYSICS LETTERS B,682,171-176.
MLA	Shao, Guo-yun,et al."Recalibration of the parameters of EXO 0748-676 and antikaon condensation in neutron star".PHYSICS LETTERS B 682(2009):171-176.