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Technical Article

On the political history of the Milky-Way Galaxy

This is a slightly more technical write up of the work in this blog post: Politics in the milky way. Summary Robin Hanson and colleagues recently proposed that “Grabby Aliens” could be the reason why humanity seems to have arrived cosmically early. In the Grabby alien model there is no

Liouville's equation

Liouville's equation

Summary I explain what the Liouville equation for the probability density function (PDF) is and its significance for weather prediction and chaotic systems more generally. I give its derivation, show how it is applied to a simple ODE and the Lorenz 63 system, I discuss its extension to the Fokker-Plank