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On closed-string twist-field correlators and their open-string descendants
Pascal Anastasopoulos, Massimo Bianchi, Robert Richter
In a recent paper we have proposed the possibility that the lightest massive string states could be identified with open strings living at intersections of D-branes forming small a…
Light stringy states
Pascal Anastasopoulos, Massimo Bianchi, Robert Richter
We carefully study the spectrum of open strings localized at the intersections of D6-branes and identify the lowest massive 'twisted' states and their vertex operators, paying part…
Scattering higher spins off D-branes
Massimo Bianchi, Paolo Teresi
We study scattering amplitudes of higher spin closed-string states off D-branes. For states in the `first Regge trajectory' we find remarkable simplifications both at tree level an…
Magnetized E3-brane instantons in F-theory
Massimo Bianchi, Andres Collinucci, Luca Martucci
We discuss E3-brane instantons in N=1 F-theory compactifications to four dimensions and clarify the structure of E3-E3 zero modes for general world-volume fluxes. We consistently i…