We meet for socialization at gathertown. Link to join will be sent to the registered participants by email.

I will discuss four avenues of applications of string field theory, and open problems thereof: RR flux, time-dependent background, open/closed duality, and D-instantons.

In this talk, I will discuss how to compute disk amplitudes of collective modes on a single D-instanton background in type IIB superstring theory, which requires several interesting ingredients of superstring field theory.

I will give a broad brush picture of a program to derive gauge-string duality in some generality. The key elements will include the reorganisation of perturbative large N gauge theory Feynman diagrams as localised integrals over closed string moduli space using the Strebel parametrisation of the latter. The general picture will be concretely illustrated by the special "tensionless string"...

The impact of SFT in deciphering string perturbation theory and giving novel insights into certain non-perturbative aspects is widely appreciated. However, the impact of SFT and the techniques it gave rise to has far-reaching applications well beyond stringy physics. For example, open string field theory can be used to gain a new perspective on BCFT. The homotopy algebra and BV formalism,...

I will discuss how to express perturbation theory in terms of gauge invariant variables to all orders in perturbations, by using homotopy transfer and the homological perturbation lemma. Then I will demonstrate how this method is applied in cosmological perturbation theory.