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Fables of reconstruction: controlling bias in the dark energy equation of state
Crittenden, RG; Zhao, GB; Pogosian, L; Samushia, L; Zhang, XM; Zhang XM(张新民)
2012
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
期号2页码:48
摘要We develop an efficient, non-parametric Bayesian method for reconstructing the time evolution of the dark energy equation of state w(z) from observational data. Of particular importance is the choice of prior, which must be chosen carefully to minimise variance and bias in the reconstruction. Using a principal component analysis, we show how a correlated prior can be used to create a smooth reconstruction and also avoid bias in the mean behaviour of w(z). We test our method using Wiener reconstructions based on Fisher matrix projections, and also against more realistic MCMC analyses of simulated data sets for Planck and a future space-based dark energy mission. While the accuracy of our reconstruction depends on the smoothness of the assumed w(z), the relative error for typical dark energy models is less than or similar to 10% out to redshift z = 1.5
关键词dark energy experiments dark energy theory
学科领域Astronomy & Astrophysics; Physics
DOI10.1088/1475-7516/2012/02/048
收录类别SCI
WOS记录号WOS:000301176000049
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被引频次:28[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224400
专题理论物理室
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Crittenden, RG,Zhao, GB,Pogosian, L,et al. Fables of reconstruction: controlling bias in the dark energy equation of state[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(2):48.
APA Crittenden, RG,Zhao, GB,Pogosian, L,Samushia, L,Zhang, XM,&张新民.(2012).Fables of reconstruction: controlling bias in the dark energy equation of state.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2),48.
MLA Crittenden, RG,et al."Fables of reconstruction: controlling bias in the dark energy equation of state".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2012):48.
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