The paper derives large-distance interquark potentials for Nambu-Goto and Polyakov strings and claims a confining R ln R term from the extrinsic-curvature string, with the derivation depending on an ad hoc cutoff and unproven asymptotic limits.
Duff, Partial Differential Equations, Toronto Press, (1956 )
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Studies on Polyakov and Nambu-Goto Random Surface Path Integrals on QCD (SU(infinity)): Interquark Potential and Phenomenological Scattering Amplitudes
The paper derives large-distance interquark potentials for Nambu-Goto and Polyakov strings and claims a confining R ln R term from the extrinsic-curvature string, with the derivation depending on an ad hoc cutoff and unproven asymptotic limits.