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Two-loop<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Φ</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>diagrams from string theory
Using the cutting and sewing procedure we show how to get Feynman diagrams, up to two-loop order, of ${\ensuremath{\Phi}}^{4}$ theory with an internal $\mathrm{SU}(N)$ symmetry group, starting from tachyon amplitudes of open bosonic string theory. In a properly defined field theory limit, we easily identify the corners of the string …