The Universe May Have Started with a Dark Big Bang - by PaulMattSutter
that takes up the vast majority of mass in the cosmos. The standard assumption in Big Bang models is that whatever process generated particles and radiation also created the dark matter. And after that the dark matter just hung around ignoring everybody else.. They argue that our inflation and Big Bang Nucleosynthesis eras were not alone. Dark matter may have evolved along a completely separate trajectory.
The advantage of this approach is that it decouples the evolution of dark matter from normal matter, so that Big Bang Nucleosynthesis can proceed as we currently understand it while the dark matter evolves along a separate track. This approach also opens up avenues to explore a rich variety of theoretical models of dark matter because now that it has a separate evolutionary track, it’s easier to keep track of in the calculations to see how it might compare to observations. For example, the team behind the paper were able to determine that if there was a so-called Dark Big bang, it had to happen when our universe was less than one month old.
The research also found that the appearance of a Dark Big Bang released a very unique signature of strong gravitational waves that would persist into the present-day universe. Ongoing experiments like pulsar timing arrays should be able to detect these gravitational waves, if they exist . We still do not yet know if a Dark Big Bang happened, but this work gives a clear pathway to testing the idea.
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