We give a version of Noether theorem adapted to the framework of mu-symmetries; this extends to such case recent work by Muriel, Romero and Olver in the framework of lambda-symmetries, and connects mu-symmetries of a Lagrangian to a suitably modified conservation law. In some cases this 'mu-conservation law' actually reduces to a standard one; we also note a relation between mu-symmetries and conditional invariants. We also consider the case where the variational principle is itself formulated as requiring vanishing variation under mu-prolonged variation fields, leading to modified Euler-Lagrange equations. In this setting, mu-symmetries of the Lagrangian correspond to standard conservation laws as in the standard Noether theorem. We finally propose some applications and examples.
|Autori:||Cicogna G; Gaeta G|
|Titolo:||Noether theorem for mu-symmetries|
|Anno del prodotto:||2007|
|Digital Object Identifier (DOI):||10.1088/1751-8113/40/39/013|
|Appare nelle tipologie:||1.1 Articolo in rivista|