# Exotic E11 branes as composite gravitational solutions

## TL;DR

This paper introduces a two-parameter group element to interpret exotic E11 branes as bound states of M-branes, suggesting a unified algebraic framework for understanding complex gravitational solutions.

## Contribution

It presents a novel algebraic approach using E11 to interpret exotic branes as bound states, expanding the understanding of M-brane configurations.

## Key findings

- Exotic branes are interpreted as non-marginal half-BPS bound states.
- The group element interpolates between M-brane solutions.
- The adjoint representation of E11 relates to bound states of fundamental M-branes.

## Abstract

A two-parameter group element is presented that interpolates between M-brane solutions. The group element is used to interpret a number of exotic branes related to the generators of the adjoint representation of E11 as non-marginal half-BPS bound states of M-branes. It is conjectured that the adjoint representation of E11 contains only generators related to bound states of fundamental M-branes which, in the limit, may be understood as membrane molecules.