Dark matter's clumpiness linked to universe's structure, say astronomers.

Researchers at the University of Toronto have proposed a theoretical breakthrough that may explain the nature of invisible dark matter and the large-scale structure of the universe known as the cosmic web. The study suggests that the "clumpiness problem" may be a sign that dark matter is composed of hypothetical, ultra-light particles called axions. The research team analyzed observations of relic light from the Big Bang and galaxy clustering data to confirm the reduced clumpiness of dark matter compared to predictions. The discovery could address fundamental questions about the nature of the universe itself.