A semi-analytic covariance matrix for ACT DR6 power spectra, combining inhomogeneous survey-depth weights and a simulation-based eigenbasis correction, reaches sub-percent agreement with Monte Carlo simulations.
27 When there is a mask in addition to a harmonic-space filter, these expressions become inexact
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The Atacama Cosmology Telescope: Semi-Analytic Covariance Matrices for the DR6 CMB Power Spectra
A semi-analytic covariance matrix for ACT DR6 power spectra, combining inhomogeneous survey-depth weights and a simulation-based eigenbasis correction, reaches sub-percent agreement with Monte Carlo simulations.