Odd Fluids

Symmetries play a major role in modern physics Very often the collective dynamics of many body classical and quantum systems is determined by the patterns of symmetries and their breaking In this talk after general discussion of the role of symmetries in fluid dynamics we will focus on a particular case of a parity or mirror symmetry Chiral fluids are the fluids with broken parity symmetry The examples of such fluids are ranging from superfluid liquid He3 A and quantum Hall fluids to suspensions of swimming microorganisms in biology The asymmetry between right and left affects the motion of these fluids in a profound way We consider various physical manifestations of the chiral nature of such fluids We will emphasize the role of odd viscosity a peculiar part of the viscous response of a fluid to a shear flow In contrast to more conventional shear viscosity the odd viscosity is non dissipative and can exist only in chiral fluids Refreshments are served at 15:15