One mathematical rule explains how quantum systems lose information from the Big Bang to modern neutrinos.
April 20, 2026
Original Paper
Universal Description of Decoherence in Scale-Invariant Environments
arXiv · 2604.15445
The Takeaway
Decoherence is the process where a quantum system interacts with its environment and loses its weird quantum properties. Most scientists assumed this process depended entirely on the specific types of particles and temperatures involved. This paper proves that any system in a scale-invariant environment follows the exact same unparticle pattern. The rule applies equally to the massive energy of the early universe and to tiny neutrinos traveling through space. It suggests a hidden, universal consistency in how reality transitions from quantum to classical states. This finding provides a unified way to study the survival of quantum information in any environment.
From the abstract
When a quantum system couples to a scale-invariant environment, what form must its decoherence take? We prove that the answer is unique: under locality, Lorentz invariance, unitarity, and continuous scale invariance, the effect of any such environment is mathematically equivalent to that of an \emph{unparticle bath} -- a scale-invariant continuum of states -- characterized entirely by the scaling dimension $d_{\mathcal{U}}$ of the coupled operator. This is not a modelling choice but a consequenc