Lensing contribution to the 21cm intensity bispectrum
  Intensity maps of the 21cm emission line of neutral hydrogen are lensed by
intervening large-scale structure, similar to the lensing of the cosmic
microwave background temperature map. We extend previous work by calculating
the lensing contribution to the full-sky 21cm bispectrum in redshift space. The
lensing contribution tends to peak when equal-redshift fluctuations are lensed
by a lower redshift fluctuation. At high redshift, lensing effects can become
comparable to the contributions from density and redshift-space distortions.
