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New Study Reimagines Dark Matter's Fiery Origins

1/26/2026

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Summary

Story summary

Researchers from the University of Minnesota Twin Cities and Université Paris-Saclay publish a study that challenges the view of dark matter as cold at formation.
They propose dark matter particles may begin as red hot and decouple during the reheating period after cosmic inflation.
Decoupling would allow dark matter to cool enough for galaxy formation later, revisiting a central cosmology debate, and the work appears in Physical Review Letters.

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Story summary

Researchers from the University of Minnesota Twin Cities and Université Paris-Saclay publish a study that challenges the view of dark matter as cold at formation.
They propose dark matter particles may begin as red hot and decouple during the reheating period after cosmic inflation.
Decoupling would allow dark matter to cool enough for galaxy formation later, revisiting a central cosmology debate, and the work appears in Physical Review Letters.