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  Quantum field theory alternatives

+ 4 like - 0 dislike
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Quantum field theory arises from the requirement that the S-matrix is lorentz scalar and obeys the cluster decomposition principle.

I want to know if there are other ways to build invariant S-Matrices that obey the cluster decomposition principle without using quantum field theory. QFT is the most natural way to do it but I'm interested in other possible approaches.

This post imported from StackExchange Physics at 2014-08-11 14:52 (UCT), posted by SE-user nabil
asked May 16, 2013 in Theoretical Physics by nabil (20 points) [ no revision ]
It would seem like string theory should also have a consistent S-matrix, though it is not a theory of particles (hence not exactly a QFT)

This post imported from StackExchange Physics at 2014-08-11 14:52 (UCT), posted by SE-user Siva
commented May 16, 2013 by Siva (720 points) [ no revision ]
Try browsing the string theory questions on physics.SE. The S-matrix for strings has been talked about quite a bit though I can't pull up the relevant questions right away.

This post imported from StackExchange Physics at 2014-08-11 14:52 (UCT), posted by SE-user Siva
commented May 16, 2013 by Siva (720 points) [ no revision ]

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