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Lensing of 21-cm Fluctuations by Primordial Gravitational Waves · Around

2011

Lensing of 21-cm Fluctuations by Primordial Gravitational Waves

Book, Laura, Kamionkowski, Marc, Schmidt, Fabian

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Weak-gravitational-lensing distortions to the intensity pattern of 21-cm radiation from the dark ages can be decomposed geometrically into curl and curl-free components.

Lensing by primordial gravitational waves induces a curl component, while the contribution from lensing by density fluctuations is strongly suppressed.
Angular fluctuations in the 21-cm background extend to very small angular scales, and measurements at different frequencies probe different shells in redshift space.
There is thus a huge trove of information with which to reconstruct the curl component of the lensing field, allowing tensor-to-scalar ratios conceivably as small as r ~ 10^{-9} - far smaller than those currently accessible - to be probed.

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