Tian-Nuo Li

Scientists have long debated: is dark energy constant or does it change? Fresh measurements point to a third path — it is conversing with dark matter. This turns a lone cosmic force into a duet of invisible interlocutors.

Scientists have proposed a model where dark energy is a transient phenomenon. It switches on at a certain stage of the cosmos's life and later switches off. Two simple parameters — the moment of onset and the strength of its influence — describe observations better than the standard idea of unchangi

Astronomers added a short-lived dark energy to the standard model, which appeared right after the Big Bang. This idea reconciled two methods of measuring cosmic expansion that previously gave different speeds—like two different thermometers. This approach strengthens the model without a major overha