The Newton's problem assuming non-constant density of the fluid

Rafael López

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arXiv · 2605.11641

The Newton's problem assuming non-constant density of the fluid

Rafael López

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Abstract

This paper investigates the Newton's problem of minimal resistance for a body moving through a fluid whose density decreases exponentially with altitude. We prove the local existence and regularity of radial solutions $u(r)$ satisfying the initial conditions $u(0)=u'(0)=0$ using a fixed-point theorem. We show that the maximal domain of the solution is finite, $[0, r_M)$, terminating at a critical slope $u'(r_M) = \frac{1}{\sqrt{3}}$.

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Rafael López. 2026-05-12. The Newton's problem assuming non-constant density of the fluid. https://arxiv.org/abs/2605.11641

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