Filling the gaps with PCO’s - Sen, Ashoke; Witten, Edward (The journal of high energy physics, 2015)
Keywords: Algorithms; Classical and Quantum Gravitation; Descriptions; Elementary Particles; High energy physics; Insertion; Perturbation theory; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Riemann surfaces; Scattering amplitude; Singularities; String Theory; Strings; Superstrings and Heterotic Strings; String theory and cosmic strings