The structure of scattering amplitudes in open-string theories can be most easily cap- tured and understood when disentangling the results from evaluation of a conformal world- sheet correlator: the latter depends on the external polarizations through a kinematical part which we will separate from ...
. pseudo-masses are needed to understand monodromy from pseudo-thresholds off the principal sheet. they can always be expressed as iterated integrals starting possibly from a pseudo-threshold of \(\phi _r^d(b_2)\) . such non-principal sheet monodromies need to be studied to understand the...
Mean Value Theorem Formula Equation | What is the mean value theorem | The Mean Value Theorem is a generalization of Rolle's Theorem, We expect that somewhere between a and b
–3– 2 Review 2.1 Tree-level open-string integrals In the computation of open-string amplitudes at tree level, one performs integrals over (ordered) marked points on the boundary of the upper-half plane, parametrising the vertex insertion points on the boundary of the genus-zero worldsheet....
Another class of singularities are the so-called non-physical singularities, i.e. singularities that are not physical, but which appear in the solution of the differential equations for a given basis of integrals (for example a canonical basis). These singularities correspond to singularities of ...