The Odd-Parity Galaxy Bispectrum
  The galaxy bispectrum contains a wealth of information about the early
universe, gravity, as well as astrophysics such as galaxy bias. In this paper,
we study the parity-odd part of the galaxy bispectrum which is hitherto
unexplored. In the standard cosmological model, the odd-parity bispectrum is
generated by galaxy velocities through redshift-space distortions. While small
in the case of General Relativity coupled with smooth dark energy, the signal
could be larger in modified gravity scenarios. Thus, apart from being a very
useful consistency test of measurements of galaxy clustering, the odd
bispectrum offers a novel avenue for searching for new physics.
