Dark matter particles being created out of the vacuum could explain why the universe is flying apart without needing dark energy.
Adiabatic dark matter particle creation generates enough internal pressure to drive the accelerated expansion of the cosmos. This model replaces the mysterious dark energy constant with a process where matter and energy are exchanged as the universe grows. Most cosmologists assume a separate, invisible force is pushing galaxies away, but this framework shows that dark matter alone can do the job. The math matches current observations of distant supernovae and cosmic microwave background radiation. Eliminating dark energy would fundamentally simplify the standard model of cosmology and change how we calculate the eventual end of the universe.