  Lattice techniques are the most reliable ones to investigate the QCD phase
diagram in the temperature-baryon density (chemical potential) plane. These
techniques are, however, well-known to be saddled with a variety of problems at
nonzero density. I address here the old question of placing the baryonic
(quark) chemical potential on the lattice and point out its important
consequences for the current and future experimental searches of the QCD
critical point.
