James Webb Telescope Finds Hints of Dark Matter Properties
Observations of distant quasars suggest that dark matter clusters may alter their structure, reports Nature
Dark matter remains invisible, but its influence on galaxies and stars is detected through gravity. The standard model assumes that its particles barely interact. However, new data from the James Webb Telescope suggest otherwise.
Astronomers studied 29 quasars—bright sources of radiation powered by black holes. Due to gravitational lensing, each quasar appears in four images: massive objects bend the path of light. Variations in the brightness of these images help detect invisible matter clusters.
The team compared observations with dark matter models. In the standard version, its clusters remain stable. An alternative hypothesis allows for dark matter particles to influence one another. In this case, clusters gradually lose density at their centers over time, then sharply compact under gravity. Such structures distort quasar light more strongly.
The telescope’s data align better with the alternative model. Bayesian evidence in its favor was 6–24 times higher than for the standard hypothesis. However, this is not proof but merely a potential signal.
The standard model could also explain the results, but this would require assuming the existence of a greater number of small dark matter clusters and star clusters than expected. Verifying such assumptions at cosmological distances is challenging—the outcome depends on the precision of gravitational lensing models.
For now, this is not a discovery but a clue. Confirmation will require new observations and independent verification.
