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Dark matter is the invisible scaffold of the cosmos, its existence betrayed by whirls of galaxies to Fritz Zwicky and Vera Rubin. What it is made of remained a mystery for half a century.

A new hypothesis paints an unusual picture. In the scorching early Universe, dark matter particles raced like light, but with expansion and cooling, they began to slow down and pair up — like dancers joining hands in a common round dance. Then, at a critical temperature, this dance froze instantly: the pairs condensed into a single quantum pattern, akin to a superconducting state. This transition explains why today dark matter is cold and motionless, and it yields a testable prediction: the distribution of matter in the Universe should be slightly sparser than previously thought.

The imprint of the frozen dance can be found by superimposing the map of ancient light (cosmic microwave background) onto the panorama of galaxy positions. If the anomaly is confirmed, we'll learn that dark matter is not a scattering of individual particles, but a unified quantum pair condensate that lies beyond the Standard Model of particle physics.

Original abstract

as written by the authors arXiv:2511.19802

We present a novel candidate for cold dark matter consisting of condensed Cooper pairs in a theory of interacting fermions with broken chiral symmetry. Establishing the thermal history from the early radiation era to the present, the fermions are shown to behave like standard radiation at high temperatures, but then experience a critical era decaying faster than radiation, akin to freeze-out that sets the relic abundance. Through a second-order phase transition, fermion - antifermion pairs condense and the system asymptotes towards zero temperature and pressure. By the present era, the non-relativistic, massive condensate decays slightly faster than in the standard scenario -- a unique prediction that may be tested by combined measurements of the cosmic microwave background and large scale structure. We also show that in the case of massive fermions, the phase transition is frustrated, and freeze-out instead leaves a residual, long-lived