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Generalization of the Froissart-Martin bounds to scattering in a space-time of general dimension

  • Chaichian, M.
  • Fischer, J.
  • Vernov, Yu.S.
Publication Date
Jan 01, 1992
DOI: 10.1016/0550-3213(92)90674-Z
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Starting from the axiomatic field-theory principles (analyticity, unitarity and polynomial boundedness) we obtain high-energy bounds on the amplitude of elastic scattering in a space-time of general dimension D . This is of interest due to recently developed theories in higher dimensions. A comparison of our bounds (which are rigorously valid only for a theory with a mass gap) with the high-energy behaviour of string amplitude, summed up to all loops by Amati, Ciafaloni and Veneziano, shows that σ inel saturates our bound, while consistency with the behaviour of σ tot requires D ⩾ 6 and a fast shrinking of the analyticity ellipse (which might indicate nonlocality of the string theory). This behaviour of σ tot is due to massless graviton exchange and violates our bounds if no shrinking of the analyticity ellipse is assumed. Our fixed-angle bound, however, is obeyed by the high-energy fixed-angle behaviour of elastic string scattering amplitudes in all orders obtained by Mende and Ooguri. We also show that analyticity of the amplitude in s leads to the well-known extension of the analyticity domain. Alternatives to polynomial boundedness (relevant to string theories) are also discussed.

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