期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 454, 期 4, 页码 4326-4334出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv2259
关键词
methods: data analysis; methods: observational; methods: statistical; largescale structure of Universe
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas de la Republica Argentina (CONICET) [PIP 11220100100350]
- Secretaria de Ciencia y Tecnica de la Universidad Nacional de Cordoba (SeCyT) [30820110100364]
- Trans-regional Collaborative Research Centre, 'The Dark Universe' of the German Research Foundation (DFG) [TR33]
The estimation of cosmological constraints from observations of the large-scale structure of the Universe, such as the power spectrum or the correlation function, requires the knowledge of the inverse of the associated covariance matrix, namely the precision matrix, Psi. In most analyses, Psi is estimated from a limited set of mock catalogues. Depending on how many mocks are used, this estimation has an associated error which must be propagated into the final cosmological constraints. For future surveys such as Euclid and Dark Energy Spectroscopic Instrument, the control of this additional uncertainty requires a prohibitively large number of mock catalogues. In this work, we test a novel technique for the estimation of the precision matrix, the covariance tapering method, in the context of baryon acoustic oscillation measurements. Even though this technique was originally devised as a way to speed up maximum likelihood estimations, our results show that it also reduces the impact of noisy precision matrix estimates on the derived confidence intervals, without introducing biases on the target parameters. The application of this technique can help future surveys to reach their true constraining power using a significantly smaller number of mock catalogues.
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