![]() ![]() While previous works had ruled out the possibility to discriminate the nature of the matter by employing data at recent epochs, data at much earlier times and ad hoc numerical simulations-the basis of the new study-were needed to provide information about the statistical trends of primordial galaxies and break the degeneracies of the models. Dark-matter models with particle masses that are equal to or lighter than such limit are excluded by the study. The research shows dark matter, the main constituent of matter in the universe, is made of particles that are either "cold" or just mildly "warm" with a mass larger than 2 keV. Umberto Maio, staff researcher at the Italian National Institute of Astrophysics (INAF), Astronomical Observatory of Trieste, and lead author of the paper describing the discovery just published in Astronomy & Astrophysics. "We found that the recent JWST galaxy detections in the first fraction of a billion years after the Big Bang are precious probes of the nature of matter," says Dr. While the commonly accepted paradigm of structure formation is based on non-relativistic matter that interacts only gravitationally, that is "cold" dark matter, alternative possibilities advocated to solve small-scale problems of the standard scenario rely on the hypothesis that dark matter is made of warm particles that possess a small, non-negligible, thermal velocity, namely "warm" dark matter.
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