Scientists from the University of Portsmouth have proposed a theoretical framework suggesting that black holes from an earlier phase of the Universe may have persisted to the present day. The research centers on alternative cosmological models known as cosmic bounce scenarios, which propose that the Universe underwent contraction before reversing course and expanding, rather than originating from a singular explosive event at the Big Bang.
Under this framework, black holes with sufficient mass could have transitioned through the cosmic bounce and remained as “cosmic fossils” in the current Universe. The researchers suggest these ancient objects might help resolve several longstanding mysteries in cosmology, including the nature of dark matter and the formation mechanisms of early galaxies. Additionally, the model could potentially explain observations from the James Webb Space Telescope showing unexpectedly massive objects in the early Universe.
The theoretical basis for this work draws on Einstein’s general relativity and quantum physics principles. Rather than the Universe collapsing into a singularity, quantum pressure at extremely high densities could theoretically halt the contraction and reverse it into expansion. According to the research, compact objects exceeding approximately 90 meters in size could survive this transition, including black holes, gravitational waves, and density fluctuations.
The proposed bounce mechanism might also address other cosmological questions, such as why the early Universe experienced rapid and uniform expansion in all directions and why the Universe’s expansion is currently accelerating. The researchers posit that if sufficient numbers of primordial black holes were generated during the bounce phase, they could constitute a substantial portion of dark matter, or potentially account for it entirely. The work identifies specific observational signatures that future experiments could test to evaluate the validity of these theoretical predictions.
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