Cosmic Tides

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We apply CMB lensing techniques to large scale structure
and solve for the 3-D cosmic tidal field. We use small scale filamentary
structures to solve for the large scale tidal shear and gravitational

By comparing this to the redshift space density field,
one can measure the gravitational growth factor on large scales without cosmic
variance. This potentially enables accurate measurements of neutrino masses and
reconstruction of radial modes lost in 21 cm intensity mapping, which are
essential for CMB and other cross correlations. We relate the tidal fields to
the squeezed limit bispectrum, and present initial results from simulations and
data from the SDSS.