Sign up ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free.

I would like to ask if it is possible to regard the Polyakov action as an effective action that describes the broken symmetric phase of a more general model. Could someone draw an analogy with O(N) Non-linear sigma model that describes the broken symmetric phase of a O(N) phi^4? What would be that model in the stringy case?

share|cite|improve this question
I believe that as in the O(3) case we relax the nonlinear constraint and can ''move'' in a normal direction to the sphere, the same could happen in the general Nlsm, and we correspondingly have the emergence of ''normal move'' from the metric, so i suppose the new model that we could take will require a bigger target space... – Panagiotis Betzios May 6 '12 at 13:45

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.