Two-Loop $φ^4$-Diagrams from String Theory

Details Two-Loop $φ^4$-Diagrams from String Theory Two-Loop $φ^4$-Diagrams from String Theory

1999-12-17

arxiv.org/abs/hep-th/9912158v1

Phys.Rev. D61 (2000) 106006

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, 12 figures

Scientific paper

10.1103/PhysRevD.61.106006

Using the {\em cutting and sewing} procedure we show how to get Feynman diagrams, up to two-loop order, of $\Phi^{4}$-theory with an internal SU(N) symmetry group, starting from tachyon amplitudes of the open bosonic string theory. In a properly defined field theory limit, we easily identify the corners of the string moduli space reproducing the correctly normalized field theory amplitudes expressed in the Schwinger parametrization.

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