A reparametrization-invariant worldsheet theory of Abelian quantum Hall interfaces yields a material charge-shape constraint and a universal linear shape bracket.
(B7) and (B19) gives δE0+2 = I ds n T0(∂sηt −Kη n) +T 2K 2(∂sηt −Kη n) + 2T2K ∂2 s ηn +K 2ηn +η t∂sK o
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An Effective String Theory Toolbox for Quantum Hall Interfaces I: Worldsheet Kinematics and Constraint Structure
A reparametrization-invariant worldsheet theory of Abelian quantum Hall interfaces yields a material charge-shape constraint and a universal linear shape bracket.