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Quanta Magazine ·For the curious

Gravity Seems Holographic. What Does That Mean for Reality?

by Charlie Wood

Published 2026-09-25 14:40:26+00:00

If a three-dimensional world can fit on a flat surface, does space actually exist?

0:00 / 19:43 · Narrator Charon

Context

In a 25 September 2026 essay, Quanta Magazine takes on a mathematical quirk that has been quietly driving theoretical physicists to distraction. The holographic principle suggests that everything happening inside a three-dimensional box can be understood just by measuring its flat outer surface. It is a concept that completely erases the physical difference between volume and area. The math works perfectly, but the implications defy human logic. If a flat boundary holds all the information of a three-dimensional room, physicists are left to wonder which one is actually real.

Show notes

An explanation of the holographic principle, a theoretical physics concept proposing that any three-dimensional volume of space can be fully described by its two-dimensional boundary. Traces the mathematical evidence from black hole entropy to the geometry of curved space, showing how this equivalence unites gravity and quantum mechanics. Outlines three competing interpretations of what this means for the physical universe.

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