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No, string theory is an attempt to bridge the gap between EVERYTHING, not just relativity and quantum, into one fundamental theory.
String theory is one of the leading candidates for a theory of everything, that is, a theory that unifies all 4 basic forces of nature, viz, gravity, the electromagnetic force, the strong force and the weak force. The last 3 forces mentioned above are described by quantum mechanics. This is the link between quantum mechanics and string theory. ps- If you believe in watertight definitions, then quantum mechanics is all the quantum theory till Dirac's equation. I'm taking quantum mechanics as the theory of the small as such, that is, all of the phenomena of the small from Plank till the standard model and beyond.
gravity/rotation
It depends on what you mean by leading. A few good candidates are string theory, the standard model and loop quantum gravity.
It doesn't mean much. The Higgs Boson is only necessary for the Standard Model to be correct; the Standard Model excludes gravity, and String Theory is a theory of quantum gravity. The two are separate from one another.
A string ends with a '\0' character,but character is not.
The difference between thread rope and string is that thread is more thicker than string and that string is more thinner than rope and thread is more thinner than rope there's your answer geese
There is practically no difference. The 7-string guitar has one lower string that the 6-string does not. It is usually tuned to B(natural).
The difference between thread rope and string is that thread is more thicker than string and that string is more thinner than rope and thread is more thinner than rope there's your answer geese
yes
A string is a specific class that is used for dealing with text data
In a word. No. Grand unification is also commonly called the Theory of everything. Which in a sense, there would exist an equation of a set of equations that every other physics equation can be derived from. A quantum theory of gravity would only help to better blend quantum mechanics and classical mechanics, not necessarily leading to a theory of everything, though it would be another step toward it.