Dark matter’s secret force does the opposite of what scientists expected

But scientists are now exploring a more complex possibility: dark matter particles may also interact through a hidden force of their own. Although the force causes dark matter to gather more efficiently, it usually does not accelerate the growth of cosmic structure. Because the interaction would operate only within the dark matter sector, researchers refer to it as a "dark force." Implications for DESI and Dark Energy ModelsThe findings could matter for theories that extend beyond dark matter alone. Some explanations proposed for recent measurements from the Dark Energy Spectroscopic Instrument (DESI) involve similar interactions among dark matter particles.