Fast radio bursts reveal that the universe’s ‘missing matter’ is found far from galaxies

Astronomers from the Massachusetts Institute of Technology (MIT) have discovered that the "missing matter" in the universe is located further away from galaxies than previously thought. This finding, which runs counter to most theoretical simulations, could help improve our understanding of how highly energetic galactic activities impact the formation of cosmic structures.

The missing matter, which makes up nearly 90% of the baryonic matter in the universe, is spread across large distances due to the effects of fast radio bursts (FRBs). When FRBs pass through the missing matter, their radio signals are stretched, or "dispersed", over time, and the amount of dispersion can be used to map the extent of the missing matter.

The researchers used data from the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and the Dark Energy Spectroscopic Instrument (DESI) to map the location of this missing matter. They found that on smaller scales, the missing matter is found around galaxies and galaxy clusters, but on larger scales, it is scattered across a radius of up to 4 million light years, significantly larger than what simulations predict.

This discovery suggests that the processes responsible for creating the missing matter, such as jets from supermassive black holes and explosions from old dying stars, are much more energetic and violent than previously thought. FRBs have emerged as a valuable tool for studying large-scale structures in the universe, and as more data becomes available from new radio telescopes, this method will become even more important for detecting the missing matter.