243 citations · 1.6k across the 48 of their papers we have counts for
48 papers
On the breakdown of the perturbative interaction picture in Big Crunch/Big Bang or the true reason why perturbative string amplitudes on temporal orbifolds diverge
Igor Pesando
We discuss how the perturbative particle paradigm fails in certain background with space-like singularity but asymptotically flat which should admit a S-matrix. The Feynman approac…
Light-Cone Quantization a of Scalar Field on Time-Dependent Backgrounds
Andrea Arduino, Igor Pesando
We discuss what is light-cone quantization on a curved spacetime also without a null Killing vector. Then we consider as an example the light-cone quantization of a scalar field on…
On the Origin of Divergences in Time-Dependent Orbifolds
Andrea Arduino, Riccardo Finotello, Igor Pesando
We consider time-dependent orbifolds in String Theory and we show that divergences are not associated with a gravitational backreaction since they appear in the open string sector…
2D Fermion on the Strip with Boundary Defects as a CFT with Excited Spin Fields
Riccardo Finotello, Igor Pesando
We consider a two-dimensional fermion on the strip in the presence of an arbitrary number of zero-dimensional boundary changing defects. We show that the theory is still conformal…
The Classical Solution for the Bosonic String in the Presence of Three D-branes Rotated by Arbitrary SO(4) Elements
Riccardo Finotello, Igor Pesando
We consider the classical instantonic contribution to the open string configuration associated with three D-branes with relative rotation matrices in SO(4) which corresponds to the…
On the gauge chosen by the bosonic open string
Igor Pesando
String theory gives S matrix elements om which is not possible to read any gauge information. Using factorization we go off shell in the simplest and most naive way and we read whi…