During reionization, the 21cm brightness field has a zero-linear-bias epoch, and if analyses reach its sampling noise floor, local primordial non-Gaussianity constraints could improve by roughly an order of magnitude.
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Local primordial non-Gaussianity from 'zero-bias' 21cm radiation during reionization
During reionization, the 21cm brightness field has a zero-linear-bias epoch, and if analyses reach its sampling noise floor, local primordial non-Gaussianity constraints could improve by roughly an order of magnitude.