Cornell graduate student Jesse Silverberg observed mosh pit activity at a heavy metal concert, and was inspired to study the movements of the dancers. Those movements turned out to be a lot like how gas particles move. To investigate, the team simulated a mosh pit with a few basic rules: the virtual moshers bounce off each other when they collide (instead of sticking or sliding through each other); they can move independently; and they can flock, or follow each other, to varying degrees. Finally, the team added a certain amount of statistical noise to the simulated moshers' movements – "to mimic the effects of the inebriants that the participants typically use", says co-author Matthew Bierbaum.
They found that by tweaking their model parameters – decreasing noise or increasing the tendency to flock, for instance – they could make the pit shift between the random-gas-like moshing and a circular vortex called a circle pit, which is exactly what they saw in the YouTube videos of real mosh pits. Their simulation is available online.
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