Cone or flask? The shape that detects confinement

In physics, confinement of particles is such an important phenomenon that the Clay Mathematics Institute has even pledged an award of a million dollars to anyone who can give a convincing and exhaustive scientific explanation from a mathematical point of view. For example, the quarks are confined in pairs or threes by the strong interaction- the force which holds the nuclei of the atoms together- making up neutrons and protons. A recent study at SISSA adds a new chapter to what we know about con...