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

## TL;DR

This paper generalizes the concept of curvature within Hamiltonian mechanics, linking it to the Einstein-Maxwell-Dilaton action, and explores its implications for particles in gravitational, electromagnetic, and scalar fields.

## Contribution

It introduces a generalized notion of curvature in Hamiltonian systems and connects it to the Einstein-Maxwell-Dilaton action in a unified geometric framework.

## Key findings

- Generalized Ricci tensor reduces to Einstein-Maxwell-Dilaton action
- Curvature concepts extend to symplectic manifolds with Lagrangian sub-manifolds
- Integral of Ricci tensor relates to field actions in physics

## Abstract

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 (\Gamma,\omega), a hamiltonian $H:\Gamma\to\mathbb{R}$ and a Lagrangian sub-manifold $M\subset\Gamma$ 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]+\phi $ 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 $\int\left[R+\frac{1}{4}F_{ik}F_{jl}g^{kl}g^{ij}-g^{ij}\partial_{i}\phi\partial_{j}\phi\right]e^{-\phi}\sqrt{g}d^{n}q$ for the scalar, vector and tensor fields.