Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.211301
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Funding
- DoE [DE-FG03-92-ER40701]
- NASA [NNX10AD04G]
- Betty and Gordon Moore Foundation
- NASA [NNX10AD04G, 135777] Funding Source: Federal RePORTER
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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 similar to 10(-9)-far smaller than those currently accessible-to be probed.
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