Timeline for What are the strings in string theory made of?
Current License: CC BY-SA 3.0
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| Apr 3, 2018 at 9:56 | comment | added | Terry Bollinger | Thanks. That's both intriguing and surprising. Linearity usually suggests underlying simplicity, thus a solution that is compact, elegant, and with few assumptions. From perspectives of both history and modern solution-space search heuristics, that suggests the real problem for both string theory and QCD is wrong assumptions. That is, Regge linearity remains inexplicable because its solution depends on breaking one or more assumptions that are (a) so "obviously" correct that no one thinks the question them, and (b) the assumptios are shared by strings and QCD. They also involve dimensions. | |
| Apr 3, 2018 at 4:00 | comment | added | Mitchell Porter | Sakai-Sugimoto has Regge trajectories but they deviate from linearity. There are other brane models where the trajectories are more linear... Sakai-Sugimoto is not considered to be the true holographic dual of QCD; it's just the best so far. (Regge trajectories are just one phenomenon among the many that a good model of the strong force should reproduce.) | |
| Apr 1, 2018 at 10:51 | comment | added | Terry Bollinger | Mitchell, thanks, I will take a look at the gluebsll paper! A clarification: I said "strong force" instead of "gluons" since as best as I can tell hadron strings cannot exist as simple loops between quarks in xyz space. That would place too many geometric constraints on hadrons. So while the strong force is providing the "substance" of hadronic strings, thinking of them as ordinary gluon interactions would likely be assuming too much. A final thought: If hadron strings are in some way "outcomes" or "examples" of strings, why didn't string theory go back and solve Regge trajectories? | |
| Apr 1, 2018 at 9:52 | comment | added | Mitchell Porter | I mostly see Sakai-Sugimoto being compared to already measured quantities and/or lattice QCD calculations. The model doesn't even contain leptons so it should only apply to purely hadronic interactions. But there is a huge literature (1000 citations) that I don't know, and a recent paper arxiv.org/abs/1710.02695 does make some glueball predictions. | |
| Mar 31, 2018 at 12:20 | comment | added | Terry Bollinger | Mitchell, thank you for adding a thoughtful, highly informative, and well-written defense of string theory! While it does not answer the question, I voted it up anyway, as you are correct that my own addendum answer included a thought experiment that was very blunt. I am not proposing FT over ST: I am suggesting that something very important mathematically was missed when the mystery of Regge trajectories was abandoned, and that it has to do with how we handle scale. Finally, a serious question: Did any of those ST influences lead to predictions that have been applied experimentally? | |
| Mar 31, 2018 at 11:16 | history | answered | Mitchell Porter | CC BY-SA 3.0 |