Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.251301
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Funding
- JSPS
- Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology
- MEXT of Japan [20740105, 21740177, 22012004]
- Grants-in-Aid for Scientific Research [22012004, 20740105, 21740177] Funding Source: KAKEN
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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.
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