Observational search for primordial chirality violations using galaxy
  angular momenta
  We search for evidence of primordial chirality violation in the galaxy data
from the Sloan Digital Sky Survey by comparing how strongly directions of
galaxy angular momenta correlate with left and right helical components of a
spin vector field constructed from the initial density perturbations. Within
uncertainties, galaxy spins correlate with these two helical components
identically, which is consistent with Universe without primordial chirality
violation. Given current data, it is not yet possible to rule out maximal
chiral violation, although the case of vanishing correlation with the right
helical component is ruled out at about 3.8$\sigma$.
