# Quantum gravity and unified theories

Movies about the research in Prof. Hermann Nicolai's division.

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#### Symmetries: The most successful principle in physics

Both Einstein's general relativity theory and the standard model of quantum field theory are based on principles of symmetry. Hermann Nicolai, Director at the Max Planck Institute for Gravitational Physics in Potsdam, explains why symmetry is the most successful principle in physics.

© Max Planck Institute for Gravitational Physics/Milde Marketing

#### Explaining the physics of everything with symmetries

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 E

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 E

_{10}, a unique infinite-dimensional mathematical structure that is still extremely mysterious, even 50 years after its discovery.
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#### Quantum Spin Dynamics in Loop Quantum Gravity

The animation visualises the quantum evolution of geometry in Loop Quantum Gravity. The colours of the faces of the tetrahedra indicate where and how much area exists at a given moment of time. The movie illustrates how these excitations of geometry change as dictated by the Quantum Einstein Equations.

Technically, the faces form a complex dual to the graph of a spin network state and the colour shows the amount of spin (area) with which the edges of the graph area are charged.

Technically, the faces form a complex dual to the graph of a spin network state and the colour shows the amount of spin (area) with which the edges of the graph area are charged.

© Max Planck Institute for Gravitational Physics/Milde Marketing

#### A journey to the strings

Starting in the macroscopic world - with a glass of water - the animation shows a journey to the tiny building blocks of matter.