Socria · Logos · working surfaces
Not one number on these is typed in. The light rays are integrated null geodesics; the disc takes its colour from its own temperature, Doppler factor and redshift; the universe’s history comes out of the Friedmann equation; and the three-body orbits are stepped forward because no formula produces them. Drag to turn, scroll to zoom, drag the bar under each to make it taller.
Every control moves the physics. The rays are integrated geodesics, not drawn curves — below bᶜ one cannot get out, and at a = 0 that is 2.60 r, not the photon orbit at 1.5.
Quarks and gluons are free. This state has been made in a collider. The universe is still opaque: light cannot cross it, which is why nothing can be seen from before last scattering at z = 1092.
Three equal masses on a figure of eight — a real solution of the three-body problem, found in 2000. There is no formula that produces this; it is here because it is being integrated.