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Pjpic
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Is there something in string theory that requires strings to be the most fundamental structure?
Pjpic said:Is there something in string theory that requires strings to be the most fundamental structure?
Civilized said:Mathematically, yes, physically, no.
atyy said:What about AdS/CFT, in that sector wouldn't strings be considered not fundamental,
since the CFT is the non-perturbative description, so strings would be "emergent"
Civilized said:Hmm, I think there are two points being mixed up here. Yes, we are closer to rigorously defining CFTs than we are to rigorously defining string theories, and it is true that the non-perturbative string dynamics could be defined through this duality. But first of all, the duality is an equivalence, so it makes no statements about which theory is more fundamental. Second, the strings live in the bulk of AdS and the CFT lives on the boundary, so the strings are not made up of the quarks and gluons in the CFT. I would use the word emergent to describe something which can be reduced to constituent parts, but there are no quarks and gluons in the bulk of the AdS space, those only exist on the boundary, so the strings floating around in the middle of AdS space are not made out of any constituent parts.
The concept of strings being the most fundamental in science refers to the idea that all matter and energy in the universe is made up of tiny, vibrating strings. These strings are thought to be the building blocks of everything in existence.
Strings are different from other particles because they are believed to be one-dimensional objects, rather than the zero-dimensional particles that make up atoms. They also vibrate at different frequencies, which gives rise to the variety of particles and forces we observe in the universe.
While there is currently no direct evidence for strings, there are many theories and mathematical models that suggest their existence. These theories also help explain phenomena that cannot be explained by traditional particle physics.
No, there are other theories and ideas about the fundamental nature of the universe, such as loop quantum gravity and the holographic principle. However, string theory is currently the leading candidate for a theory that can unify all of the fundamental forces in the universe.
Understanding whether strings are the most fundamental can help us answer some of the biggest questions in physics, such as the nature of gravity, the origin of the universe, and the existence of other dimensions. It can also potentially lead to new technologies and advancements in our understanding of the universe.