Velocity Syzygies and Bounding Syzygy Moments in the Planar Three-Body Problem

TL;DR

This paper studies the planar three-body problem, showing that with negative energy, solutions have infinitely many velocity syzygies and providing bounds on their occurrence times.

Contribution

It introduces new bounds on the timing of velocity syzygies using comparison theory for matrix Riccati equations.

Findings

Infinite velocity syzygies for negative energy solutions

Velocities become parallel within intervals containing three syzygies

Derived new upper and lower bounds on syzygy moments

Abstract

We consider the Newtonian planar three-body problem, defining a syzygy (velocity syzygy) as a configuration where the positions (velocities) of the three bodies become collinear. We demonstrate that if the total energy is negative, every collision-free solution has an infinite number of velocity syzygies. Specifically, the velocities of the three bodies become parallel within every interval of time containing three consecutive syzygies. Using comparison theory for matrix Riccati equations, we derive new upper and lower bounds on the moments when syzygies occur.