# String field theory as world-sheet UV regulator

@article{Sen2019StringFT, title={String field theory as world-sheet UV regulator}, author={Ashoke Sen}, journal={Journal of High Energy Physics}, year={2019}, volume={2019} }

Even at tree level, the first quantized string theory suffers from apparent short distance singularities associated with collision of vertex operators that prevent us from straightforward numerical computation of various quantities. Examples include string theory S-matrix for generic external momenta and computation of the spectrum of string theory under a marginal deformation of the world-sheet theory. The former requires us to define the S-matrix via analytic continuation or as limits of…

## 29 Citations

### Localization of effective actions in heterotic string field theory

- MathematicsJournal of High Energy Physics
- 2020

We consider the algebraic couplings in the tree level effective action of the heterotic string. We show how these couplings can be computed from closed string field theory. When the light fields we…

### Classical algebraic structures in string theory effective actions

- MathematicsJournal of High Energy Physics
- 2020

We study generic properties of string theory effective actions obtained by classically integrating out massive excitations from string field theories based on cyclic homotopy algebras of A∞ or L∞…

### D-instanton Effects in Type IIB String Theory

- Physics
- 2022

We study D-instanton contributions to supergraviton scattering amplitudes in the ten-dimensional type IIB superstring theory beyond the leading non-perturbative order. In particular, we determine the…

### Closed string deformations in open string field theory. Part I. Bosonic string

- PhysicsJournal of High Energy Physics
- 2021

This is the first of a series of three papers on open string field theories based on Witten star product deformed with a gauge invariant open/closed coupling. This de- formation is a tree-level…

### The classical cosmological constant of open-closed string field theory

- PhysicsJournal of High Energy Physics
- 2022

We consider deformations of D-brane systems induced by a change in the closed string background in the framework of bosonic open-closed string field theory, where it is possible to unambiguously tame…

### D-instantons, string field theory and two dimensional string theory

- PhysicsJournal of High Energy Physics
- 2021

In [4] Balthazar, Rodriguez and Yin (BRY) computed the one instanton contribution to the two point scattering amplitude in two dimensional string theory to first subleading order in the string…

### D-instanton perturbation theory

- PhysicsJournal of High Energy Physics
- 2020

D-instanton world-volume theory has open string zero modes describing collective coordinates of the instanton. The usual perturbative amplitudes in the D-instanton background suffer from infra-red…

### Fixing an ambiguity in two dimensional string theory using string field theory

- PhysicsJournal of High Energy Physics
- 2020

In a recent paper, Balthazar, Rodriguez and Yin found some remarkable agreement between the results of c = 1 matrix model and D-instanton corrections in two dimensional string theory. Their analysis…

### Fixing an Ambiguity in Two Dimensional String Theory Using String Field Theory

- Physics
- 2019

In a recent paper, Balthazar, Rodriguez and Yin found some remarkable agreement between the results of c=1 matrix model and D-instanton corrections in two dimensional string theory. Their analysis…

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