# Boundary Carroll CFTs: SUSY and Superstrings

## TL;DR

This paper develops boundary superconformal Carrollian theories, introduces new algebraic structures, and constructs an open null superstring with boundary symmetries, advancing understanding of tensionless superstrings and boundary symmetries.

## Contribution

It introduces two variants of boundary superconformal Carrollian algebra and constructs the first open null superstring with boundary symmetries.

## Key findings

- Boundary superconformal Carrollian algebras constructed
- Open null superstring formulated with boundary symmetries
- Homogeneous algebra realized as worldsheet symmetry

## Abstract

We consider two dimensional superconformal Carrollian theories with boundaries and construct two variants of the Boundary Superconformal Carrollian Algebra (BSCCA), viz. the Homogeneous and the Inhomogeneous, by making appropriate identification of the parent superconformal Carrollian algebras. These new algebras are then recovered by appropriate limits of a single copy of Super Virasoro algebra. We then focus on the theory of null tensionless superstrings and construct, for the first time, an open null superstring. The Homogeneous version of the BSCCA is realised as worldsheet symmetries on this open null superstring.