String Theory claims strings to be one dimensional objects vs. dimensionless point particles of the Standard Model. String Theory also needs 10 or possibly more spatial dimensions to operate in. There is also a popular view in cosmology of a Holographic universe. i.e. Leonard Susskind's "Holographic Universe". ( From what I am reading in journals reduces the spatial dimensions of our universe to two dimensions. ) Are we to assume the two views, one of the universe and one of fundamental particles are at odds. ?
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So actually they are compatible. It says that a string theory in 3D for AdS (anti deSitter) spacetime which describes a universe with quantum gravity can be mapped (i.e., there is some correspondence) to a conformal field theory (CFT) in 2D, in the spatial boundary of that universe. This gave rise to the holographic principle, unproven but also not disproven, that a solution with quantum gravity in 3D can be instead solved as a CFT in 2D, so solve whichever is easier to solve (usually the CFT problem) and then map to the corresponding solution for the other one (usually the string theory, which normally does not easily, or uneasily, yield exact solutions).
The mapping, or correspondence, though not fully determined (ie, how exactly to go from one solution to the other) so still work to do, it is proceeding slowly case by case, and so it is more a suggestive relationship than a real theory. I believe there's been a few, very small specific identified mappings.
The person who proved that one example of the correspondence (AdS to CFT) was Maldacena. A truly genial insight. Susskind and others have hypothesized that it is a general principle and can be used to find solutions that are otherwise hard to find. So far so good and there's been useful research done from it. It has given people also some ideas on how to try to figure out how to quantize gravity. It and a few other things have made CFT of great interest in theoretical physics.
Some people even hypothesized that the 3D world is an illusion and our real existence is in 2D. Most physicists ignore this (except for the few making money lecturing on it or writing speculative physics books on it), and do the real physics work.