Essays from the Institute - worked-out mathematics and physics, meant to be read more than once. Pieces here also appear on our Substack.
A four-part series on why, in cosmology, choosing a clock is a gauge choice - from the constraint analysis of the FLRW scalar field to the contact geometry of the reduced dynamics, and where that picture breaks.
Read the series →One set of 120 quaternions, followed as far as it goes: the golden ratio behind them, the E₈ lattice they seed, the four-dimensional solid they trace out, and the string theory that asks for them in sixteen.
Read the series →