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What is the general theory that describes the interactions between strings? I mean the basic object in the theory is (closed) string and they have interactions among them. The string theory, as I learned now (I am far from an expert!), describes only one string. Can anyone recommend a reference of such a theory?

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String theory is the theory of the propagation and interaction of strings. Any textbook on String theory will have several chapters devoted to the calculation of string scattering amplitudes.

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string theory does not describe only one string, quite the opposite, each particle is a string. The theory also describe the interactions between particles, and so, between strings.

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  • $\begingroup$ Thank you for your inspiration. Can you tell me a reference of the above formulism? Especially about the gauge theory. $\endgroup$ – hehuan0430 Sep 23 '14 at 14:27
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As other answers have pointed out already, String theory describes not only one string, the basic objects are open and closed strings, also there are some other fundamental ones such as D-branes. As a firrst book to read I would recommend Zwiebach, "A first course in String Theory".

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