Impact of the local void on the cosmological parameters

	Impact of the local void on the cosmological parameters
	Yu, Bo1,2
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2013-03-01
卷号	0 期号:3 页码:4PP
关键词	dark energy theory supernova type Ia - standard candles
ISSN号	1475-7516
通讯作者	Yu, B (reprint author), Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China. Email: yubo@pmo.ac.cn
英文摘要	In this paper, I discuss the effects of a local void on the cosmological parameters. It is found that, if the supernova distance is absolutely calibrated, then the bias of all the cosmological parameters is always important, while if the supernova distance is relatively calibrated, the largest effects will appear in the dark energy equation of state. For a local void of size similar to 100Mpc, the bias effects mainly manifest in the low redshift range. Therefore, the piecewise dark energy equation of state, especially the one in the range of lowest redshift, will be more strongly affected than the constant equation of state. In order to reduce this bias in constraining the cosmological parameters, one could require the distance of all the adopted supernovas be greater than 1.2 similar to 1.5 times of the radius of the local void. In this case, the residual bias can be safely ignored.
学科主题	Astronomy & Astrophysics, Physics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
关键词[WOS]	IA SUPERNOVAE ; HUBBLE-BUBBLE ; DARK ENERGY
收录类别	SCI
语种	英语
WOS记录号	WOS:000316989200014
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9909]
专题	紫金山天文台_南极天文中心
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Yu, Bo. Impact of the local void on the cosmological parameters[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013,0(3):4PP.
APA	Yu, Bo.(2013).Impact of the local void on the cosmological parameters.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,0(3),4PP.
MLA	Yu, Bo."Impact of the local void on the cosmological parameters".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 0.3(2013):4PP.