Vortices observed and to be observed

Linens defects are generic in continuous media. In quantum systems they app ear as topological line defects which are associated! with a circulating pe rsistent current. In relativistic quantum vacuum they an known as cosmic st rings, in superconductors as quantized flux fines, and in superfluids and l ow-density atomic Bose-Einstein condensates as quantized vortex lines. We d iscuss unconventional vortices in unconventional superfluids and supercondu ctors, which have been observed or have to be observed, such as continuous singly and doubly quantized vortices in He-3-A and chiral Bose condensates; half-quantum vortices (Alice strings) in He-3-A and in nonchiral Bose cond ensates; Abrikosov vortices with fractional magnetic flux in chiral and d-w ave superconductors; vortex sheets in He-3-A and chiral superconductors; th e nexus combined object formed by vortices and monopoles. Some properties o f vortices related to the fermionic quasiparticles living in the vortex cor e are also discussed.