SEMI-BASIC 1-FORMS AND HELMHOLTZ CONDITIONS FOR THE INVERSE PROBLEM OF THE CALCULUS OF VARIATIONS

被引:30
作者
Bucataru, Ioan [1 ]
Dahl, Matias F. [2 ]
机构
[1] Alexandru Ioan Cuza Univ, Fac Math, Iasi 700506, Romania
[2] Aalto Univ, Inst Math, Helsinki 02015, Finland
基金
芬兰科学院;
关键词
Poincare-Cartan; 1-form; Helmholtz conditions; inverse problem; projective metrizability; Finsler metrizability; TANGENT BUNDLE; GEOMETRY; EQUATIONS; FORMS;
D O I
10.3934/jgm.2009.1.159
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
We use Frolicher-Nijenhuis theory to obtain global Helmholtz conditions, expressed in terms of a semi-basic 1-form, that characterize when a semispray is a Lagrangian vector field. We also discuss the relation between these Helmholtz conditions and their classic formulation written using a multiplier matrix. When the semi-basic 1-form is 1-homogeneous (0-homogeneous) we show that two (one) of the Helmholtz conditions are consequences of the other ones. These two special cases correspond to two inverse problems in the calculus of variation: Finsler metrizability for a spray, and projective metrizability for a spray.
引用
收藏
页码:159 / 180
页数:22
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