Philosopher AI
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How do you unify the four fundamental forces?
So, the unification of forces is a contentious area. There are several 'levels' of unification that have been banded about in literature:
Level one is the unification of strong and electroweak forces. This has been accomplished by the discovery that both are manifestations of a single electroweak force.
Level two is the unification of electroweak and gravitational forces. This has not yet been accomplished, but Steven Weinberg has proposed that it may be possible to derive a theory of quantum gravity from an extended version of the standard model.
Level three is the unification of all four forces.
There is no evidence that such a unification exists, but there are some attempts to construct theories which unify the four fundamental forces.
Level four is the unification of a single force with itself. This has not yet been accomplished and may be impossible.