Not quite science fiction, but definitely speculative.
If mini black holes are detected at the LHC, then it would arguably support several ideas: parallel universes, extra dimensions, string theory, and gravity’s rainbow—with these last two having implications for a theory of quantum gravity. Most obviously, a positive result would support the existence of mini black holes themselves.
“If mini black holes are detected at the LHC at the predicted energies, not only will it prove the existence of extra dimensions and by extension parallel universes, but it will also solve the famous information paradox in black holes,” Ali said. Solving the paradox is possible because, in the gravity’s rainbow model, mini black holes have a minimum radius below which they cannot shrink.
However, if black holes are not detected, the scientists will need to reexamine their understanding of these ideas.
Read more at: http://phys.org/news/2015-03-mini-black-holes-lhc-parallel.html#jCp.
While very interesting, the popular press has typically run with a bleeding-edge idea and presented it as fact. Even if the LHC detects mini black holes physicists will have a lot of work to do interpreting the results and developing new theories to explain the results.
Indeed, mini black holes might have been produced in the earliest stages of the Big Bang, just by fluctuations in the very dense ‘quark soup’ at that time without any need for parallel universes, extra dimensions, or indeed fundamental string ‘particles’. If the enhanced LHC reproduces such densities it might form mini BHs by a similar process.
These fluctuations in density simply take small volumes of space and collapse them a small amount but sufficient enough to push their density above the critical ‘Schwarzschild density’ at which event horizons form.
Some of these should be exploding about now but have not yet been conclusively identified.
A detection of mini BHs in the enhanced LHC would certainly be interesting but would not necessarily be evidence for the suggested exotic physics.
Should we be worried? Any such LHC produced BHs will be a lot smaller than the BB ones and would vapourize/explode almost immediately and release the same energy as went into creating them. Occasional ultra-energetic cosmic rays have been detected with far more energy than this and we haven’t had any problems so far….