The Dark Matter Answer May Have Arrived From Before Time Began

Physicists have spent decades hunting dark matter, the invisible substance that accounts for roughly 27 percent of the universe's total mass-energy content, and found nothing. A new paper in Physical Review D suggests the reason may be almost unbearably simple: we have been looking in the wrong universe.

The model comes from Enrique Gaztañaga, a research professor at the Institute of Space Sciences in Barcelona and the University of Portsmouth. It combines two ideas that rarely intersect: cyclic universes and primordial black holes. The framework proposes something called the cosmic bounce, a universe that does not begin from a singularity but expands, contracts and expands again in an endless cycle. These aren't parallel universes. They're sequential — each one born from whatever the last cosmos left behind.

The key finding is about what survives the transition. Gaztañaga shows that any structure larger than about 90 meters (295 feet) could pass through the final collapse of a universe and survive the rebound, leaving behind relics that carry information from a previous cosmic epoch: black holes, gravitational waves and density fluctuations. Those black holes would not have needed to be generated by extreme fluctuations or finely tuned inflationary processes. They would simply have been there from the first instant.

That may explain one of the more stubborn puzzles from the James Webb Space Telescope: a population of compact, extremely red objects in the early universe, sometimes called "little red dots," that appear unexpectedly massive and luminous only a few hundred million years after the Big Bang. Standard cosmology struggles to account for them. Relic black holes from a previous cosmos, Gaztañaga argues, explain them naturally.

The model still needs to be tested against gravitational-wave backgrounds, galaxy surveys and precision measurements of the cosmic microwave background. The work is far from settled.

The question that has occupied cosmologists for nearly a century may turn out to have an answer that predates the question itself.

Read the full story at Wired, April 16, 2026

Hot Take: The particle physicists built billion-dollar detectors in salt mines to find dark matter, and a theorist in Barcelona may have located it by asking whether anything survived the previous universe, using only the physics we already had. The LHC found the Higgs; the cosmic bounce may have handed us the fossils.