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<blockquote data-quote="freyar" data-source="post: 6854034" data-attributes="member: 40227"><p>I don't want to be too blunt, but that's just incorrect, actually. If you build a big enough particle collider, you will see a very distinctive spectrum of resonances ("new particles") corresponding to the vibrational states of strings. This will be on top of the other distinctive, but more model-dependent spectrum of resonances due to the presence of some kind of extra dimensions. Now, is it possible to make some other model without strings that looks exactly the same way? Yes, if you make up an infinite number of new particles with exactly the right properties. It is also possible to describe the solar system with the earth at the center if you ignore Newtonian gravity and set up a bunch of epicycles, but we don't think of that as being the correct thing to do. </p><p></p><p>It is of course not feasible to build a collider like this with current technology --- if you tried to scale up the LHC, you'd likely have to build something a significant fraction of the size of the solar system, given typical guesses about the scale of string theory. But the problem is exactly "The theory makes predictions, but our machines aren't good enough yet" for this most basic prediction.</p><p></p><p>Here's another prediction of string theory: the existence of gravity. That's a little flippant, but it's true --- no one expected gravity to turn up in string theory when it was first invented. No other theory can explain why there is gravity, either.</p><p></p><p>More on this later, at least if people are interested.</p></blockquote><p></p>
[QUOTE="freyar, post: 6854034, member: 40227"] I don't want to be too blunt, but that's just incorrect, actually. If you build a big enough particle collider, you will see a very distinctive spectrum of resonances ("new particles") corresponding to the vibrational states of strings. This will be on top of the other distinctive, but more model-dependent spectrum of resonances due to the presence of some kind of extra dimensions. Now, is it possible to make some other model without strings that looks exactly the same way? Yes, if you make up an infinite number of new particles with exactly the right properties. It is also possible to describe the solar system with the earth at the center if you ignore Newtonian gravity and set up a bunch of epicycles, but we don't think of that as being the correct thing to do. It is of course not feasible to build a collider like this with current technology --- if you tried to scale up the LHC, you'd likely have to build something a significant fraction of the size of the solar system, given typical guesses about the scale of string theory. But the problem is exactly "The theory makes predictions, but our machines aren't good enough yet" for this most basic prediction. Here's another prediction of string theory: the existence of gravity. That's a little flippant, but it's true --- no one expected gravity to turn up in string theory when it was first invented. No other theory can explain why there is gravity, either. More on this later, at least if people are interested. [/QUOTE]
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