Using the BlueTides simulation, the authors predict cosmic variance for z>7 galaxies: 3-10% for WFIRST's 10 deg^2 field, 20-50% for JWST medium/deep fields, and dominant over Poisson noise in most surveys.
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Cosmic variance of $z>7$ galaxies: Prediction from BlueTides
Using the BlueTides simulation, the authors predict cosmic variance for z>7 galaxies: 3-10% for WFIRST's 10 deg^2 field, 20-50% for JWST medium/deep fields, and dominant over Poisson noise in most surveys.