# Parabolic orbits in Celestial Mechanics: a functional-analytic approach

## TL;DR

This paper establishes the existence of specific parabolic solutions in celestial mechanics using a functional-analytic approach, applicable to various classical problems like the N-body and N-centre problems.

## Contribution

It introduces a novel functional-analytic method to prove the existence of parabolic orbits asymptotic to central configurations in complex celestial mechanics models.

## Key findings

- Existence of half-entire parabolic solutions proven
- Applicable to N-centre, N-body, and restricted (N+H)-body problems
- Method relies on perturbative argument in a suitable functional space

## Abstract

We prove the existence of half-entire parabolic solutions, asymptotic to a prescribed central configuration, for the equation \begin{equation*} \ddot{x} = \nabla U(x) + \nabla W(t,x), \qquad x \in \mathbb{R}^{d}, \end{equation*} where $d \geq 2$, $U$ is a positive and positively homogeneous potential with homogeneity degree $-\alpha$ with $\alpha\in\mathopen{]}0,2\mathclose{[}$, and $W$ is a (possibly time-dependent) lower order term, for $\vert x \vert \to +\infty$, with respect to $U$. The proof relies on a perturbative argument, after an appropriate formulation of the problem in a suitable functional space. Applications to several problems of Celestial Mechanics (including the $N$-centre problem, the $N$-body problem and the restricted $(N+H)$-body problem) are given.