  We calculate the galaxy bispectrum in both real and redshift space adopting
the most common prescriptions for local Eulerian biasing and Lagrangian
evolving-bias model. We show that the two biasing schemes make measurably
different predictions for these clustering statistics. The Eulerian
prescription implies that the galaxy distribution depends only on the
present-day local mass distribution, while its Lagrangian counterpart relates
the current galaxy distribution to the mass distribution at an earlier epoch
when galaxies first formed. Detailed measurement of the galaxy bispectrum (of
its reduced amplitude) can help establish whether galaxy positions are
determined by the current mass distribution or an earlier mass distribution.

Astrophysics