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Browsing by Author "Wang, Yihong"

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    A note on on-shell recursion relation of string amplitudes
    (2013-02-01)
    Chang, Yung-Yeh
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    Feng, Bo
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    Fu, Chih-Hao
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    Lee, Jen-Chi
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    Wang, Yihong
    In 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.
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    Note on soft graviton theorem by KLT relation
    (2014-11-18)
    Du, Yi-Jian
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    Feng, Bo
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    Fu, Chih-Hao
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    Wang, Yihong
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    電子物理學系
    Recently, new soft graviton theorem proposed by Cachazo and Strominger has inspired a lot of works. In this note, we use the KLT-formula to investigate the theorem. We have shown how the soft behavior of color ordered Yang-Mills amplitudes can be combined with KLT relation to give the soft behavior of gravity amplitudes. As a byproduct, we find two nontrivial identities of the KLT momentum kernel must hold.