一种新的接触哈密顿量和接触Hamilton-Jacobi理论
A novel approach to contact Hamiltonians and contact Hamilton-Jacobi theory
摘要：
我们提出了一种新的方法接触哈密顿力学，在文献中占主导地位的一个相反，也为非平凡的切触结构。在这种方法中，哈密尔顿算子不再是切触流形M本身上的函数，而是M上的线丛的截面，或者等价地，是某个GL（1，R）-主丛P \to M上的1-齐次函数，它具有齐次辛形式ω。换句话说，我们对接触几何的理解是，它不是辛几何的“奇维表亲”，而是后者的一部分，即“齐次辛几何”。这种对切触结构的理解比传统的理解简单得多，并且在应用中非常有效，将接触哈密顿形式化为标准辛图。我们在这种语言中发展的接触哈密顿力学的自治，以及时间依赖的情况下，和相应的哈密顿-雅可比理论。基本的例子是基于线丛L的截面的第一个喷束J^1（L）上的正则切触结构，它在接触几何中起着基本的作用，类似于余切丛在辛几何中所起的作用。
英文摘要：
We propose a novel approach to contact Hamiltonian mechanics which, in contrast to the one dominating in the literature, serves also for non-trivial contact structures. In this approach Hamiltonians are no longer functions on the contact manifold M itself but sections of a line bundle over M or, equivalently, 1-homogeneous functions on a certain GL(1,R)-principal bundle P\to M which is equipped with a homogeneous symplectic form ω. In other words, our understanding of contact geometry is that it is not an `odd-dimensional cousin' of symplectic geometry but rather a part of the latter, namely `homogeneous symplectic geometry'. This understanding of contact structures is much simpler than the traditional one and very effective in applications, reducing the contact Hamiltonian formalism to the standard symplectic picture. We develop in this language contact Hamiltonian mechanics in autonomous, as well as time-dependent case, and the corresponding Hamilton-Jacobi theory. Fundamental examples are based on canonical contact structures on the first jet bundles J^1(L) of sections of line bundles L, which play in contact geometry a fundamental role similar to that played by cotangent bundles in symplectic geometry.
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