On Wigner's theorem

2011/12/09 by Daniel S. Freed, Freed, Daniel S.
Mathematics · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #Mathematical Physics (math-ph) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #cond-mat.mes-hall #hep-th #math-ph #math.MP

paper · pdf · doi:10.48550/arxiv.1112.2133

5 pages; small changes in v2; final small changes for publication in v3

arxiv created 2012/07/31 · arxiv updated 2012/08/01

Abstract

Wigner's theorem asserts that any symmetry of a quantum system is unitary or antiunitary. In this short note we give two proofs based on the geometry of the Fubini-Study metric.

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