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The authors study cosmological intensity fluctuations in the Hydrogen 21-cm line as a promising future probe for primordial non-gaussianity, which is beyond the CMB anisotropy sensitivity and would distinguish between different models of inflation. They extract the intrinsic non-gaussian nature of 21-cm fluctuations, forecasting a significantly increased sensitivity.
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Muñoz et al. (2015) studied this question.
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