A trajectory map for the pressureless Euler equations

Hynd, Ryan

doi:10.1090/tran/8118

A trajectory map for the pressureless Euler equations
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Trans. Amer. Math. Soc. 373 (2020), 6777-6815 Request permission

Abstract:

We consider the dynamics of a collection of particles that interact pairwise and are restricted to move along the real line. Moreover, we focus on the situation in which particles undergo perfectly inelastic collisions when they collide. The equations of motion are a pair of partial differential equations for the particles’ mass distribution and local velocity. We show that solutions of this system exist for given initial conditions by rephrasing these equations in Lagrangian coordinates and then by solving for the associated trajectory map.

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