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> Instead, they try to solve everything analytically... This seems like a common refrain it lots of things I see (not just this one paper). Can anyone give a

by floxy 5y ago

> Instead, they try to solve everything analytically... This seems like a common refrain it lots of things I see (not just this one paper). Can anyone give a lay man's explanation why we can't just numerically simulate general relativity? As in, plug a simulation with 100 billion stars in to a super computer and see what comes out.

ncmncm 5y ago
It ought to suffice to simulate the motion of exactly one star, in a circular orbit, for exactly one time-step, just adding up all the effects of each of the 1e11 or so other stars, plus interstellar medium. There are two possible end states: either it follows the circle--no dark matter needed--or it swings wide.