Disconnected Covariance of 2-point Functions in Large-Scale Structure

Understand

Optimal analyses using the 2-point functions of large-scale structure probes require accurate covariance matrices.

• A covariance matrix of the 2-point function comprises the disconnected part and the connected part.
• While the connected covariance only becomes important on small scales, the disconnected covariance is dominant on large scales, where the survey window has a significant impact.
• In this work, we develop an analytical method to compute the disconnected covariance, accounting for the window effect.