Applied String Field Theory (ASFT)


String field theory has developed over the recent years into a potentially very useful tool for tackling some of the profound issues in string theory, namely how to connect classical open or closed string backgrounds via tachyon condensation and/or deduce the existence and study properties of new ones. It is also a longstanding idea that string theory possesses a huge underlying higher spin gauge symmetry which should become manifest in the tensionless limit of the theory, and recently impressive progress has been made in this direction. The structure of string field theory is expected to become especially simple and transparent in this limit, since all the fields should organize themselves into multiplets and gauge invariance strongly constrains the allowed interactions. In this project we will construct and explore the string field theory describing tensionless strings in Anti-de-Sitter backgrounds with the help of holographic duality.