A quantum theory using mathematical functions to describe subatomic interactions in terms of particles that are not directly detectable.
- This picture was improved upon by using a non-abelian gauge theory, Quantum Chromodynamics.
- A gauge theory would therefore also be a description of quantum gravity in a particular background space-time.
- The obvious thing to do was to try it out on the simplest gauge theory of all, electrodynamics - to break its symmetry to see what really happens.
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