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2020

Cosmological constraints from BOSS with analytic covariance matrices

Wadekar, Digvijay, Ivanov, Mikhail M., Scoccimarro, Roman

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We use analytic covariance matrices to carry out a full-shape analysis of the galaxy power spectrum multipoles from the Baryon Oscillation Spectroscopic Survey (BOSS).

We obtain parameter estimates that agree well with those based on the sample covariance from two thousand galaxy mock catalogs, thus validating the analytic approach and providing substantial reduction in computational cost.
We also highlight a number of additional advantages of analytic covariances.
First, the analysis does not suffer from sampling noise, which biases the constraints and typically requires inflating parameter error bars.

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