title: Hydrodynamics of polar liquid crystals.
abstract: Starting from a microscopic definition of an alignment vector proportional to the polarization, we discuss the hydrodynamics of polar liquid crystals with local C infinity v symmetry. The free energy for polar liquid crystals differs from that of nematic liquid crystals (D infinity h) in that it contains terms violating the n --> -n symmetry. First we show that these Z2-odd terms induce a general splay instability of a uniform polarized state in a range of parameters. Next we use the general Poisson-bracket formalism to derive the hydrodynamic equations of the system in the polarized state. The structure of the linear hydrodynamic modes confirms the existence of the splay instability.
authors.affiliation: Department of Physics, Syracuse University, Syracuse, New York 13244, USA. wkung@physics.syr.edu
authors.forename: William
authors.initials: W
authors.lastname: Kung
authors.forename: M Cristina
authors.initials: MC
authors.lastname: Marchetti
authors.forename: Karl
authors.initials: K
authors.lastname: Saunders