Nature of Phase transitions... Phase transitions reflect the self- organization of a system and are ruled by common properties such as predicted by universality classes and RG. They are therefore present in all domains of Physics : Solid, liquid and gas phases Plasma (electrons, QGP, ...) Magnetic properties in solid state matter (para/ferromagnets) Bose-Einstein condensates Superfluidity (Cooper pairs) Fundamental symmetries breakings (matter/antimatter, electroweak, ...) Nuclei ! ...