Precise estimation of cosmological parameters using a more accurate likelihood function.

Precise estimation of cosmological parameters using a more accurate likelihood function.
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DOI:
10.1103/physrevlett.105.251301
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发表时间:
2010-11
影响因子:
8.6
通讯作者:
Masanori Sato;K. Ichiki;T. Takeuchi
Masanori Sato;K. Ichiki;T. Takeuchi
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Masanori Sato;K. Ichiki;T. Takeuchi

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从一个给定的数据集的宇宙学参数的估计需要一个似然函数的建设,在一般情况下,有一个复杂的函数形式。我们采用高斯copula,并构造了一个copula似然函数的收敛功率谱从弱透镜调查。我们表明,基于高斯似然的参数估计错误地引入了系统的偏移的置信区域,特别是,对于暗能量状态方程的参数w。因此,Copula似然函数应该在未来的宇宙学观测中使用。
The estimation of cosmological parameters from a given data set requires a construction of a likelihood function which, in general, has a complicated functional form. We adopt a Gaussian copula and constructed a copula likelihood function for the convergence power spectrum from a weak lensing survey. We show that the parameter estimation based on the Gaussian likelihood erroneously introduces a systematic shift in the confidence region, in particular, for a parameter of the dark energy equation of state w. Thus, the copula likelihood should be used in future cosmological observations.