The usual equation for both motions of a single planet around the sun and electronsin the deterministicRutherford-Bohratomic model is conservative with a singular potential at the origin. When a dissipation is added, new phenomena appear. It is shown that whenever the momentum is not zero, the moving particle does notreach the center in finite time and its displacement does not blow-up either, even in the classical context where arbitrarily large velocities are allowed.Moreover we prove that all bounded solutions tend to $0$ for $t$ large, andsome formal calculations suggest the existence of special orbits with an asymptotically spiraling exponentially fast convergence to the center.
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Subject: Physical Sciences - Mathematical Physics
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