Forward period analysis and the long term simulation of a periodic Hamiltonian system

TL;DR

This paper introduces a forward period analysis method to accurately compute the periods of periodic Hamiltonian systems, enabling reliable long-term simulations from quantum to cosmological timescales.

Contribution

The paper presents a novel forward period analysis technique combined with a parallel multiple-precision Taylor series scheme for efficient long-term simulation of periodic Hamiltonian systems.

Findings

Accurately computed periods of Morse oscillator and pendulum to 100 significant digits.

Enabled reliable long-term simulations up to 10^60 time units.

Reduced computational complexity for long-term simulations.

Abstract

The period of a Morse oscillator and mathematical pendulum system are obtained, accurate to 100 significant digits, by forward period analysis (FPA). From these results, the long-term [0, 10^60] (time unit) solutions, which overlap from the Planck time to the age of the universe, are computed reliably and quickly with a parallel multiple-precision Taylor series (PMT) scheme. The application of FPA to periodic systems can reduce the computation loops of long-term reliable simulation from O(t^(1+1/M)) to O(lnt+t/h0) where T is the period, M the order and h0 a constant step-size. This scheme provides a way to generate reference solutions to test other schemes' long-term simulations.