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Equivalence of Two Contour Prescriptions in Superstring Perturbation Theory
Ashoke Sen
Conventional superstring perturbation theory based on the world-sheet approach gives divergent results for the S-matrix whenever the total center of mass energy of the incoming par…
Wilsonian Effective Action of Superstring Theory
Ashoke Sen
By integrating out the heavy fields in type II or heterotic string field theory one can construct the effective action for the light fields. This effective theory inherits all the…
One Loop Mass Renormalization of Unstable Particles in Superstring Theory
Ashoke Sen
Most of the massive states in superstring theory are expected to undergo mass renormalization at one loop order. Typically these corrections should contain imaginary parts, indicat…
Unitarity of Superstring Field Theory
Ashoke Sen
We complete the proof of unitarity of (compactified) heterotic and type II string field theories by showing that in the cut diagrams only physical states appear in the sum over int…
Reality of Superstring Field Theory Action
Ashoke Sen
We determine the reality conditions on the string fields that make the action for heterotic and type II string field theories real.
Cutkosky Rules for Superstring Field Theory
Roji Pius, Ashoke Sen
Superstring field theory expresses the perturbative S-matrix of superstring theory as a sum of Feynman diagrams each of which is manifestly free from ultraviolet divergences. The i…