paper

General U(N) gauge transformations in the realm of covariant Hamiltonian field theory

arXiv:1205.5754 · doi:10.1007/978-3-319-00047-3_31

Abstract

A consistent, local coordinate formulation of covariant Hamiltonian field theory is presented. For regular Legendre transformations, the covariant canonical field equations are equivalent to the Euler-Lagrange field equations. The covariant canonical transformation theory provides a systematic means of defining admissible mappings that preserve the variational principle --- and hence the form of the field equations --- with the corresponding transformation of the Hamiltonian. Similar to the well-known canonical transformation theory of point dynamics, the canonical transformation rules for fields are derived from generating functions. As an interesting example, we work out the generating function of type F_{2} of a general local U(N) gauge transformation and thus derive a form-invariant Hamiltonian description under local U(N) gauge transformations, choosing the conventional quadratic gauge-field kinetic term. For a particular regular Dirac Lagrangian, the resulting gauge-invariant Lagrangian L_3 includes Pauli-coupling of an N-tuple of fermions with the set of bosonic gauge fields. Its coupling is controlled by an independent constant mass scale, and its relation to the Dirac-Pauli Lagrangian is a total divergence.

39 pages, Symposium on Exciting Physics: Quarks and gluons/atomic nuclei/biological systems/networks, Makutsi Safari Farm, South Africa, 13-20 November 2011; Exciting Interdisciplinary Physics, Walter Greiner, Ed., FIAS Interdisciplinary Science Series, Springer International Publishing Switzerland, 2013

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