Dark energy and dark matter are the invisible conductors of the cosmos. Usually considered independent, new research proposes seeing them as dance partners. The lead — dark energy — changes the mass of dark matter particles. Like a dancer who lifts and lowers their partner, dark energy increases or decreases the weight of dark matter. This energy exchange precisely reproduces the observed expansion of the Universe, including its recent weirdness. This interaction alters the growth of galaxies and their clusters by about 10% — a subtle difference future telescopes can catch. The most surprising part: the mass changes only in recent cosmic epochs, so the early history of the Universe remains untouched. It seems the dark substances are having a complex dialogue. Perhaps their conversation will explain the discoveries of Saul Perlmutter, Adam Riess and Vera Rubin.
The mass of dark matter particles may oscillate in sync with the expansion of the Universe, as if they are breathing.