QQ客服 官方微博 反馈留言

	Constraints on the generalized tachyon field models from latest observational data
	Rong Jia Yang ; Shuang Nan Zhang ; Yuan Liu
	2010-05-06 ; 2010-05-06
关键词	Theoretical or Mathematical/ cosmology dark energy dark matter red shift tachyons/ generalized tachyon field models gold SNIa observational data shift parameter transitional redshift dark energy component early universe Lambda CDM model linear density perturbations unified dark matter GTF density fluctuations/ A9880L Observational cosmology A9880D Theoretical cosmology A9850H Red shift, distances, and spatial distribution of galaxies
中文摘要	We consider constraints on generalized tachyon field (GTF) models from latest observational data (including 182 gold SNIa data, the shift parameter, and the acoustic scale). We obtain at 68.3% confidence level Omega /sub m/ = 0.37 +/- 0.01, k/sub 0/ = 0.09/sub -0.03//sup +0.04/, alpha = 1.8/sub -0.7//sup +7.4/ (the best fit values of the parameters) and z/sub q//sub =//sub 0/~0.47-0.51 (the transitional redshift) for GTF as the dark energy component only; k/sub 0/ = 0.21/sub -0.18//sup +0.20/, alpha = 0.57 +/- 0.01 and z/sub q//sub =//sub 0/~0.49-0.68 for GTF as the unification of dark energy and dark matter. In both cases, GTF evolves like dark matter in the early universe. By applying model-comparison statistics and testing with independent H(z) data, we find that the GTF dark energy scenario is favored over the Lambda CDM model, and the Lambda CDM model is favored over GTF unified dark matter by the combined data. For GTF as the dark energy component, the fluctuations of matter density are consistent with the growth of linear density perturbations. For GTF unified dark matter, the growth of GTF density fluctuations goes more slowly for , meaning that GTF does not behave as classical Lambda CDM scenarios.
语种	英语 ; 英语
出版者	IOP Publishing Ltd. ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/15294]
专题	清华大学
推荐引用方式 GB/T 7714	Rong Jia Yang,Shuang Nan Zhang,Yuan Liu. Constraints on the generalized tachyon field models from latest observational data[J],2010, 2010.
APA	Rong Jia Yang,Shuang Nan Zhang,&Yuan Liu.(2010).Constraints on the generalized tachyon field models from latest observational data..
MLA	Rong Jia Yang,et al."Constraints on the generalized tachyon field models from latest observational data".(2010).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。