Abstract
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.
Original language | English |
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Article number | 110401 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 106 |
Issue number | 11 |
DOIs | |
Publication status | Published - 16 Mar 2011 |
Externally published | Yes |