Including braiding and in-survey covariance increases forecast error bars on the dark energy parameter w by about 120% for a Euclid-like galaxy survey and is a necessary ingredient for a mathematically valid covariance matrix.
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The impact of braiding covariance and in-survey covariance on next-generation galaxy surveys
Including braiding and in-survey covariance increases forecast error bars on the dark energy parameter w by about 120% for a Euclid-like galaxy survey and is a necessary ingredient for a mathematically valid covariance matrix.