Scientists may have a new way to peer into physics' "dark world."
In a new paper, theoretical physicists say they have a new plan for searching for theoretical particles that, so far, have never been observed. These particles, dubbed long-lived particles, or LLPs, could be a window into dark matter and dark energy, which together make up 95% of the universe. Dark matter exerts a gravitational pull on ordinary matter, and dark energy is thought to cause the universe's expansion to accelerate. But neither can be directly observed, because any interactions they have with the luminous matter of the universe are feeble, said Zhen Liu, a postdoctoral researcher at the University of Maryland.
https://www.space.com/physicists-hunt-for-dark-world-particles.html