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A few years ago, a group of physicists came up with an ingenious way to test for the existence of hidden dimensions, a key aspect of many string theory models. Basically, the experiment rests upon the existence of micro black holes, objects tinier than an atomic nucleus that could theoretically be produced by smashing together a pair of protons at tremendously high velocities.
Well, they ran the experiment, and the results are less than encouraging. The LHC has completed an extensive search for these objects in high-energy proton collisions, and no evidence at all turned up for micro black holes between 3.5 and 4.5 tera-electron-volts. That's a massive energy level and pretty much the upper limit of what we can currently test. This more or less rules out versions of string theory that includes micro black holes at those energies.
They've been working on string theory for how long? Four decades? I think that's long enough.
Originally posted by Thill
To be fair , the article states that this does not invalidate the string theory just yet , but it does put it into the realms of doubt .