Via livescience.com: The universe may be dominated by particles that break causality and move faster than light, new paper suggests by Paul Sutter

With the nature of the universe's two most elusive components up for debate, physicists have proposed a radical idea: Invisible particles called tachyons, which break causality and move faster than light, may dominate the cosmos.

Could the cosmos be dominated by particles that move faster than the speed of light? This model of the universe agrees surprisingly well with observations, a pair of physicists has discovered.

In a new paper that has yet to be peer-reviewed, the physicists propose that our universe is dominated by tachyons — a hypothetical kind of particle that always moves faster than light. Tachyons almost certainly don't exist; going faster than light violates everything we know about the causal flow of time from past to future. But the hypothetical particles are still interesting to physicists because of the small chance that even our most closely held notions, like causality, might be wrong...

Full article: https://www.livescience.com/physics-mathematics/dark-matter/the-universe-may-be-dominated-by-particles-that-break-causality-and-move-faster-than-light-new-paper-suggests