# Four Lectures on Closed String Field Theory

## TL;DR

This paper provides an overview of closed string field theory, summarizing key concepts and developments discussed in review lectures at a major physics institute, aimed at advancing understanding of string interactions.

## Contribution

It compiles and clarifies foundational aspects of closed string field theory based on recent review lectures, offering insights into its structure and applications.

## Key findings

- Summarizes core principles of closed string field theory
- Highlights recent progress and open problems in the field
- Provides a pedagogical overview for researchers and students

## Abstract

The following notes derive from review lectures on closed string field theory given at the Galileo Galilei Institute for Theoretical Physics in March 2019.