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
中科院分区:
文献类型:
--
作者:
Masanori Sato;K. Ichiki;T. Takeuchi
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.