One way would be through the production of microscopic black holes.
But if the force of gravity is actually a lot stronger, we could easily overwhelm the other forces of nature and produce black holes?If gravity is strong enough, we could already be manufacturing tiny black holes in the LHC right now.
These tiny black holes are not a cause for alarm — they would evaporate in less than 10^minus 27 seconds, transmuting into a shower of particles well before they did anything interesting like swallowing Earth.But to date we haven't seen any of particle sprays suggestive of microscopic black holes or extra dimensions.
Previous calculations of how often the LHC would create microscopic black holes made some simple assumptions about how the black holes would form and how they would interact with the universe around them.
This group's more precise calculations reveal that, assuming all those extra dimensions exist and gravity is secretly superstrong, the LHC can produce far fewer microscopic black holes than we previously realized.Depending on the number of hypothetical extra dimensions, the number of these teensy black holes could be as low as one-tenth of the previous estimates.
And if a microscopic black hole does make an appearance in our data, it would mean that what we think of as the universe is just a small bubble embedded in a much larger framework — and we would have to completely rewrite our understanding of gravity.