  Superfluid 3He-A and high-temperature superconductors both have gapless
fermionic quasiparticles with the "relativistic" spectrum close to the gap
nodes. The interaction of these "relaitivistic" fermions with bosonic
collective modes of the order parameter is described by the quantum field
theory, which results in a close connection with particle physics. Many
phenomena in high-energy physics and cosmology can thus be simulated in
superfluid phases of 3He and in unconventional superconductors. This includes
axial anomaly, vacuum polarization, zero-charge effect, fermionic charge of the
vacuum, baryogenesis, event horizon, vacuum instability, Hawking radiation,
etc. Analogs of some of these phenomena, which are related to the axial
anomaly, have been experimentally simulated in superfluid 3He. This includes
the baryogenesis by textures (Manchester), the baryogenesis by cosmic strings
(Manchester) and the generation of the primordial magnetic field via the axial
anomaly (Helsinki).
