Geometric phases and hidden gauge symmetry

Details Geometric phases and hidden gauge symmetry Geometric phases and hidden gauge symmetry

2009-10-02

arxiv.org/abs/0910.0396v1

APCTP Bull.23-24:29-35,2009; APCTP Bull.23-24 2009:29-35,2009

Physics

Quantum Physics

6 pages. To be published in the Bulletin of Asia-Pacific Center for Theoretical Physics (APCTP)

Scientific paper

The second quantized approach to geometric phases is reviewed. The second quantization generally induces a hidden local (time-dependent) gauge symmetry. This gauge symmetry defines the parallel transport and holonomy, and thus it controls all the known geometric phases, either adiabatic or non-adiabatic, in a unified manner. The transitional region from the adiabatic to non-adiabatic phases is thus analyzed in a quantitative way. It is then shown that the topology of the adiabatic Berry's phase is trivial in a precise sense and also the adiabatic phase is rather fragile against the non-adiabatic deformation. In this formulation, the notion such as the projective Hilbert space does not appear.

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