A universal law for random fluctuations. A. Kavokin and S. Kavokina in Science 392:144 (2026). What the paper says!?
This is a perspective by Alexey and Stella on Sven Höfling et al.[1]'s demonstration of the Kardar-Parisi-Zhang (KPZ) physics in two dimensions, namely, in microcavity polaritons.
They bring a fairly concise viewpoint:
Widmann et al.(5) report an observation of the KPZ theory in a 2D platform that is different from a crystal surface, proving that diverse physical systems can share fundamentally similar predictable behavior.
Bits with possibly more insights include:
The KPZ scaling appeared to prevail over the equilibrium model implying that the nonequilibrium dynamics of the exciton-polariton condensates could be governed by the Nambu-Goldstone modes
A philosophical point of view:
From a philosophical point of view, this may be seen as a manifestation of harmony in nature that persists despite diversity in its constituents.
The point on dimensionality, which I believe is the main outcome of Sven's work:
Beyond validation of 2D KPZ scaling, demonstrating the KPZ theory in higherdimension systems could further confirm its remarkable universality. Theoretically, it is plausible that nonequilibrium dynamics of 3D physical systems would also fall within the scaling rule (12). A 3D array of exciton-polariton condensates made of a resonant photonic crystal could expand the observation into higher dimensions.