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Foundations of Quantum Gravity by James Lindesay

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9 Gravitation of interacting systems

Although the composite system of internally interacting constituents might undergo geodesic motion, the individual interacting components themselves generally do not. This final chapter will briefly examine common methods of introducing microscopic interactions into gravitational physics.

9.1 A charged geometry

Electromagnetism is considered by many to be the most well understood of fundamental interactions. The theory manifests local gauge invariance, which is reflected by phase symmetry in its quantum version. Most micro-physical models of more complicated interactions build upon gauge symmetries as fundamental characteristics of viable theories. Therefore, as a means of gaining insights into the interplay ...

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