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Are we close to a unified theory? Secondly what is the Chaotic Theory?

The answer to your first question is no. We are not close to a unified theory. So far the electromagnetic and weak forces have been unified but we still have strong nuclear force and gravity to be unified. Of these gravity is a very different kind of force and poses most problems.

Chaotic theory, or as it is better known, non-linear dynamics, studies systems which are described by non-linear dynamics. These are very hard to solve, and many times the systems have a peculiar behavior. We assume that two systems having almost identical initial conditions will always be in states close by. Non-linear dynamics has shown that it need not be true, even for the simplest systems. This finds its applications in many diverse situations.

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