Curvature in Hamiltonian Mechanics And The Einstein-Maxwell-Dilaton Action

英文摘要：

Riemannian geometry is a particular case of Hamiltonian mechanics: the orbits of the hamiltonian $H=\frac{1}{2}g^{ij}p_{i}p_{j}$ are the geodesics. Given a symplectic manifold (Γ,ω), a hamiltonian $H:Γ\to\mathbb{R}$ and a Lagrangian sub-manifold $M\subsetΓ$ we find a generalization of the notion of curvature. The particular case $H=\frac{1}{2}g^{ij}\left[p_{i}-A_{i}\right]\left[p_{j}-A_{j}\right]+ϕ$ of a particle moving in a gravitational, electromagnetic and scalar fields is studied in more detail. The integral of the generalized Ricci tensor w.r.t. the Boltzmann weight reduces to the action principle $\int\left[R+\frac{1}{4}F_{ik}F_{jl}g^{kl}g^{ij}-g^{ij}\partial_{i}ϕ\partial_{j}ϕ\right]e^{-ϕ}\sqrt{g}d^{n}q$ for the scalar, vector and tensor fields.