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Under conventional Legendre transformation, systems with a non-convex Lagrangian will result in a multi-valued Hamiltonian as a function of conjugate momentum.
For a comprehensive monograph, see: R. T. Rockafellar, Convex Analysis , Princeton University Press, Princeton, 1970
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C. Teitelboim and J. Zanelli, in Constraints Theory and Relativistic Dynamics , eds. C. Longhi and L. Lusanna (World-Scientific, 1987)
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E.g., M. E. Peskin and D. V. Schroeder, “An Introduction to Quantum Field Theory", (cf. p.368-369), Westview Press, 1995
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Alfred Shapere and Frank Wilczek, Phys. Rev. Lett. 109
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Alfred Shapere and Frank Wilczek, Phys. Rev. Lett. 109
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L. Zhao, P. Yu, and W. Xu, Mod. Phys. Lett. A 28
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