Why does D=4, rather than more (or less)? An Orwellian explanation

TL;DR

This paper proposes that two strict assumptions about classical gravity uniquely determine the spacetime dimension as D=4, providing an explanation for why our universe has four dimensions.

Contribution

It introduces a novel, straightforward argument based on classical gravity assumptions that explains the specific dimensionality of spacetime.

Findings

Space-time dimension is fixed at D=4 by gravity assumptions

The explanation is simple and based on classical physics

Supports the special status of four-dimensional spacetime in physics

Abstract

Two simple, if Draconian, assumptions about classical gravity fix space-time's dimension at D=4