Quantum field theory and Einstein´s general relativity are not compatible with each other within the known physical laws. But if we want to understand what happens inside a black hole or at the Big Bang, we need a theory that combines both.

Hermann Nicolai, Director at the Max Planck Institute for Gravitational Physics in Potsdam, describes his approach towards the unification of gravity with the interactions of elementary particles. It is based on symmetry E10, a unique infinite-dimensional mathematical structure that is still extremely mysterious, even 50 years after its discovery.

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