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Although all observations support the expanding Universe model, observations of the early period of the cosmos give a lower rate of acceleration than more local observations. We call it theSo, let's add a new idea to the pile: what if dark matter evolves?First, the observations we have of dark matter are excellent.
They point to the presence of some kind of material that doesn't interact strongly with light.Second, the vast majority of folk opposed to dark matter focus on eliminating it altogether through things like modified gravity. They figure dark matter is fundamentally wrong, not something to be tweaked. DESI has made the largest 3D map of our universe to date. Earth is at the center of this thin slice of the full map. , the authors look at both evolving dark energy and evolving dark matter and argue that the latter is a much better fit to observational data. The first thing they note is that the two models are somewhat related. Since the evolution of the cosmos depends in part on the ratio of energy density to matter density, a model with constant dark matter and evolving dark energy will always appear similar to a model with evolving dark matter and constant dark energy. They then go on to explore the idea of some kind of exotic dark matter. One that has a changeable equation of state . To match observation, the dark matter EOS must oscillate in time.have mass and don't interact strongly with light. While they can't account for all the dark matter of the Universe, they are a form of hot dark matter. And neutrinos undergo Perhaps cold dark matter particles undergo a similar oscillatory effect. The authors find that the best fit to observational data is a Universe where about 15 percent of the cold dark matter is oscillatory and the remaining 85% is standard dark matter. This would allow for the Hubble tension to be covered while still matching the dark matter observations we have. It should be stressed that this work presents a toy model. As the authors themselves note the work does is a broad concept that does not pin down specific constraints for dark matter particles. But this work does open the door to a broader range of dark matter models. At this point, evolving dark matter is worth considering.
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