A note on on-shell recursion relation of string amplitudes [PDF]
Yung-Yeh Chang, Bo Feng, Chih-Hao Fu, Jen-Chi Lee, Yihong Wang, Yi YangIn the application of on-shell recursion relation to string amplitudes, one challenge is the sum over infinite intermediate on-shell string states. In this note, we show how to sum these infinite states explicitly by including unphysical states to make complete Fock space.View original: http://arxiv.org/abs/1210.1776
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