A reappraisal of Lagrangians with non-quadratic velocity dependence and branched Hamiltonians

• URL: http://arxiv.org/abs/2403.18801v2
• Date: Mon, 8 Jul 2024 05:40:05 GMT
• Title: A reappraisal of Lagrangians with non-quadratic velocity dependence and branched Hamiltonians
• Authors: Bijan Bagchi, Aritra Ghosh, Miloslav Znojil,
• Abstract summary: Non-conventional forms of Lagrangians with non-quadratic velocity dependence have found attention in the literature. For various examples, we emphasize upon the emergence of the notion of momentum-dependent mass in the theory of branched Hamiltonians.
• Score: 7.00493617363289
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Time and again, non-conventional forms of Lagrangians with non-quadratic velocity dependence have found attention in the literature. For one thing, such Lagrangians have deep connections with several aspects of nonlinear dynamics including specifically the types of the Li\'{e}nard class; for another, very often the problem of their quantization opens up multiple branches of the corresponding Hamiltonians, ending up with the presence of singularities in the associated eigenfunctions. In this article, we furnish a brief review of the classical theory of such Lagrangians and the associated branched Hamiltonians, starting with the example of Li\'{e}nard-type systems. We then take up other cases where the Lagrangians depend upon the velocity with powers greater than two while still having a tractable mathematical structure, while also describing the associated branched Hamiltonians for such systems. For various examples, we emphasize upon the emergence of the notion of momentum-dependent mass in the theory of branched Hamiltonians.

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