Basics
of String Theory
A theory of everything (ToE) or final theory or string theory is a putative theory of theoretical physics that
fully explains and links together all known physical phenomena, and predicts
the outcome of any experiment that could be carried out in principle.The term mainly refers to the desire
to reconcile the two main successful physical frameworks, general relativity which
describes gravity and the large-scale structure of spacetime and qantum field theory particularly as implemented in the standard model which describes the small-scale structure of matter while incorporating the other three
non-gravitational forces, the weak, strong and electromagnetic interactions.
A
primary stumbling block in the construction of theory of everything is that straight forward attempts to apply quantum mechanics to the
gravitational field, in the same way as for say the electromagnetic field,
fails due to the breakdown of the renormalization procedure. Thus
the central issue is how to combine general relativity and quantum mechanics. This is also
one of the unsolved problems in physics.
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