Quantum history
Encyclopedia
In some physics
theories, choosing a 3-geometry via spin network
and 4-geometry via spin foam
, any superposition of spin networks is called a kinematical state and any superposition of spin foams is called a quantum history.
Physics
Physics is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.Physics is one of the oldest academic...
theories, choosing a 3-geometry via spin network
Spin network
In physics, a spin network is a type of diagram which can be used to represent states and interactions between particles and fields in quantum mechanics. From a mathematical perspective, the diagrams are a concise way to represent multilinear functions and functions between representations of...
and 4-geometry via spin foam
Spin foam
In physics, a spin foam is a topological structure made out of two-dimensional faces that represents one of the configurations that must be summed to obtain a Feynman's path integral description of quantum gravity...
, any superposition of spin networks is called a kinematical state and any superposition of spin foams is called a quantum history.