Abstract
We study the behaviour of the geometric phase under isometries of the ray space. This leads to a better understanding of a theorem first proved by Wigner: isometries of the ray space can always be realised as projections of unitary or anti-unitary transformations on the Hilbert space. We suggest that the construction involved in Wigner’s proof is best viewed as an use of the Pancharatnam connection to ‘lift’ a ray space isometry to the Hilbert space.
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Samuel, J. The geometric phase and ray space isometries. Pramana - J Phys 48, 959–967 (1997). https://doi.org/10.1007/BF02847455
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DOI: https://doi.org/10.1007/BF02847455