Dark big bang theory
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Dark Big Bang Theory: Formation of Dark Matter and Gravitational Waves
Dark Big Bang and the Dark Sector Phase Transition
The "dark big bang" theory proposes that, in addition to the well-known hot big bang that created ordinary matter and radiation, there was a separate, later event in the dark sector of the universe. This event involved a first-order phase transition, where dark vacuum energy was converted into a hot plasma of dark particles. This process could have produced dark matter and possibly dark radiation, independent of the visible matter created in the standard big bang. The dark big bang could have occurred after primordial nucleosynthesis but before the universe was a month old, ensuring consistency with cosmic microwave background and structure formation constraints Freese2023Casey2024.
Mechanisms for Dark Matter Production
In this scenario, dark matter could be produced through several mechanisms:
- Dark matter cannibalism or pair-annihilation within the dark sector, followed by thermal freeze-out, can set the correct dark matter abundance.
- Alternatively, ultra-heavy "dark-zilla" dark matter could be generated directly from bubble collisions during the dark big bang phase transition Freese2023Casey2024.
These mechanisms allow for a wide range of dark matter properties, including self-interacting or warm dark matter, which could have observable effects on small-scale cosmic structures .
Gravitational Wave Signatures
A key prediction of the dark big bang theory is the generation of gravitational waves during the dark sector phase transition. These gravitational waves could be detectable by pulsar timing array experiments, providing a unique observational signature for this scenario. This is particularly important because dark matter produced in this way would evade traditional direct and indirect detection methods .
Theoretical Models and Experimental Constraints
Models of the dark big bang require the dark sector to be strongly decoupled from the visible sector, interacting only through gravity. Recent work has mapped out the allowed parameter space for the tunneling potentials that could drive the dark big bang, ensuring consistency with all current experimental bounds .
Alternative and Related Theories
Other theories have explored the relationship between dark matter, black holes, and the big bang. For example, some suggest that primordial black holes formed from a "cold" explosion of axion-like dark matter could be responsible for the universe's matter content, rather than a hot big bang . There are also proposals that dark matter could be explained by exotic particles or phenomena, such as "dark photons" or matter emerging from higher-dimensional spaces, but these ideas remain speculative and require new physics beyond current models Sakho2024Sakho2025Cox2019.
Conclusion
The dark big bang theory offers a compelling alternative to traditional views on the origin of dark matter, suggesting it could have formed in a separate event after the visible universe's big bang. This scenario is consistent with current cosmological observations and provides testable predictions, especially in the form of gravitational wave signals. As future experiments probe these predictions, the dark big bang may become a crucial piece in understanding the universe's hidden components Freese2023Casey2024.
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