Eleonora Di Valentino

Different ways to measure the expansion rate, the properties of dark matter and energy, yield contradictions. Before changing physics, scientists are checking if their instruments are off. But increasingly it seems: the yeast is alive, and the recipe of the cosmos is not eternal.

Eight models of interaction between dark energy and dark matter fit observations better than the standard theory. Surprisingly, in the past, dark energy density could have been negative—like an energy debt in the dance. The finding refines the history of the expansion of the universe.

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.

The 'late-waking' dark energy model: the mysterious force lay dormant for the first few billion years, then suddenly kicked in later. Telescope data allow for such a scenario, and in some combinations, it’s even more likely than the standard one. Yet the biggest puzzle—the discrepancy in measuring t

A team of astrophysicists conducted a systematic examination of extensions to the standard ΛCDM cosmological model, using data from telescopes like Planck, DESI, Pantheon+, and others. They added dynamic dark energy, spatial curvature, massive neutrinos, and additional inflationary parameters. It tu