Hidden neutrinos could solve cosmology's biggest measurement clash

DESI's latest measurements of the universe's expansion history conflict with CMB observations and laboratory neutrino experiments—a sign something is missing from our standard cosmological model. The authors propose that sterile neutrinos (hypothetical particles that barely interact with normal matter) coupled to a light mediator could reconcile these tensions. The model improves agreement between datasets by 3 sigma and also eases the disputed measurement of how fast the universe is expanding.