Abstract
In the framework of the compactified closed bosonic string theory with the extra spatial coordinates being circular with radius , we perform both the zero-slope limit and the limit of the tree scattering amplitude of four massless scalar particles. We explicitly show that this double limit leads to amplitudes involving scalars which interact through the exchange of a scalar, spin 1 and spin 2 particle. In particular, this latter case reproduces the same result obtained in linearized quantum gravity.
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