# Nonlinear Dynamics In Quantum Physics -- Quantum Chaos and Quantum Instantons

**Authors:** H. Kröger  
**arXiv:** [quant-ph/0302169](https://arxiv.org/abs/quant-ph/0302169)  
**Date:** 2003-02-21  
**Summary page:** https://www.summarizepaper.com/fr/paper/quant-ph--0302169v1/

## Abstract

We discuss the recently proposed quantum action - its interpretation, its motivation, its mathematical properties and its use in physics: quantum mechanical tunneling, quantum instantons and quantum chaos.