Breakdown of the coherent state path integral: two simple examples

Details Breakdown of the coherent state path integral: two simple examples Breakdown of the coherent state path integral: two simple examples

2010-12-06

arxiv.org/abs/1012.1328v1

Phys. Rev. Lett. 106, 110401 (2011)

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevLett.106.110401

We show how the time-continuous coherent state path integral breaks down for both the single-site Bose-Hubbard model and the spin path integral. Specifically, when the Hamiltonian is quadratic in a generator of the algebra used to construct coherent states, the path integral fails to produce correct results following from an operator approach. As suggested by previous authors, we note that the problems do not arise in the time-discretized version of the path integral.

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