Representation theory of the Lorentz group
Representation of the symmetry group of spacetime in special relativity / From Wikipedia, the free encyclopedia
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The Lorentz group is a Lie group of symmetries of the spacetime of special relativity. This group can be realized as a collection of matrices, linear transformations, or unitary operators on some Hilbert space; it has a variety of representations.[nb 1] This group is significant because special relativity together with quantum mechanics are the two physical theories that are most thoroughly established,[nb 2] and the conjunction of these two theories is the study of the infinite-dimensional unitary representations of the Lorentz group. These have both historical importance in mainstream physics, as well as connections to more speculative present-day theories.