Spiky Phases of Smooth Membranes. Implications for Smooth Strings

We point out a possible mechanism by which smooth surfaces can become spiky as the constant of curvature stiffness $κ$ falls below certain critical values. This happens either in a single first-order transition, or in a sequence of two Kosterlitz-Thouless-like transitions. There may also be additional phases in which the spikes form a hexagonal solid-like array or a disordered liquid-like structure. Our discussion suggests that there exist smooth strings between quarks.

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