Also if the hopes of other research directions are realized, it would be a triumph.
Nice model, but calling it a test of string theory is a bit of a stretch, since the exact same prediction can be obtained through suitable choice of potential in a canonical scalar field model, with no reference at all to to UV physics.
lined up even in that extreme case. in the context that even some well established Everything you need to know about and expect during, the most important election of our lifetimes, 6-Pack: 80ct Antibacterial Wipes (480 Total). But it would be useful to have *one*. for theory and experiment not being perfectly The distinction is important. When I interviewed Abhay Ashtekar he seemed to be saying that in one sense LGQ is not a competitor to string theory and in another sense it is. The smaller the probability of the model being ruled out in their lifetime, the better. The problem though is how to evaluate the situation of a speculative idea that has generated a huge number of such models, none of which has worked out.
some ways, there’s no way to test Researchers hoped to find certain exotic phenomena that would likely exist in a world governed by string theory. Perhaps you can point me to the relevant passage if I have that wrong. Lots of theorists produce lots of models that have no chance of ever being tested or ruled out because that’s how they earn a living. The title is I guess intended to be playful, not referring to its accurate description of the current state of string theory, but to the possibility of irrelevant operators having observable effects.
Unfortunately those trying to defend science against its opponents like to insist otherwise, see for example the Wikipedia entry: The rather absurd comparison of the testability of string theory to that of EM is surprising to see, but not at all unusual in this kind of document.
The article is structured as a defense of string theory, without explaining at all what the serious criticisms of string theory actually are. Surely, it would be more accurate to refer to string/superstring “musings” or “speculations” (and similarly for inflationary cosmology). I am not seeing anything that implies he’s changed his mind about this.
Receive weekly updates with the most interesting articles and exclusive content. The existence of multiple consistent theoretical possibilities implies greater information content in the measurements. On the other hand, no one knows what, if any, are the consequences of string theory just because there is, so far, no such theory.
When I say “string theory has failed”, I mean specifically failure as a unified theory, not that “one should abandon all its ideas” (of which there are many, of many different kinds). of being reasonable and accurate.
in this echo chamber. But the paragraph you omitted ” To evaluate theories, they routinely employ a vaste array of non-empirical ar- guments, increasing or decreasing their confidence in this or that theoretical idea, before the hard test of empirical confirmation (on this, see Chapter VIII of [2]). Each of these different shapes corresponds to a different possible universe, or "vacuum state", with a different collection of particles and forces. This more or less rules out versions of string theory that includes micro black holes at those energies. LQG does not do this and in that sense it is not a competitor to string theory. You are arguing against The only contribution from a physicist that I’ve seen that argued the case for the failure of string theory was that from Carlo Rovelli, see here. To worry that physicists’ acceptance of. I don’t believe he was a saying that string theory has failed. All that is fine, but here's the unequivocal truth: string theory has failed as a scientific theory. I’d agree with the first and last part.
It was heresy (literally).
She doesn’t mention the LHC at all, especially not the negative results about supersymmetry and extra dimensions that it has produced. I claim neither the intellect nor the background to understand the complexities of String Theory. 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. In practice, this would require discovering a smoking gun signature (such as a low string scale at colliders, or perhaps a very distinctive pattern of primordial perturbations in cosmology), and nothing particularly favors such scenarios currently. Isn’t string theory (again, also inflationary cosmology) more a set of interesting speculations and suggestive calculations that might (or might not) someday lead to an actual theory than currently being a real physical theory?
ways of interpreting and presenting your subjects. constrained, but that is still valid science, which is a In my view, the role of supersymmetry is chronically over-emphasized in the field, and hence understandably also in the article by Ellis and Silk.
Brilliant theoretical physicists tell us that this theory is the best answer to the hardest problem that their field has ever attacked. of their predictions to be tested, the timescales
Eva Silverstein has a new preprint out, entitled The Dangerous Irrelevance of String Theory.
One would expect an argument being made in an academic context like this to make an attempt to address both sides of the argument, refer to the other side in the bibliography, and not make obviously absurd claims (one question here, are these contributions being refereed?). ‘True.
The impetus behind that conference was a December 2014 article in Nature entitled Scientific method: Defend the integrity of physics. Some of these basic mechanisms had not been considered at all outside of string theory, and some not quite in the form they take there, with implications for effective field theory and data analysis that go well beyond their specifics. That argument is now dead. I think the comparison to EM or GR is pretty much absurd. We probably shouldn't have expected anything else. String theory (like inflationary cosmology) simply is not (yet) a well-defined theory that makes clear, unambiguous empirical predictions. …that you left out. Every scientist from the time of Aristotle until Copernicus believed the universe revolved around the earth and they created elaborate theories to reconcile observational data (retrograde orbits). Even a few small things can throw this off - the micro black holes might still exist, but they might be larger than the curvature of the hidden dimensions, which would mean they remain unaffected by the extra dimensions. At what point do you decide that this is an unpromising line of research, better to try just about anything else? I hope it will, and I am a bit more optimistic here than Peter.
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