Exact Classical Effective Potential

Details Exact Classical Effective Potential Exact Classical Effective Potential

1999-05-26

arxiv.org/abs/quant-ph/9905089v1

Proceedings of Sixth International Conference on Path Integrals from peV to TeV, Firenze, eds R Casalbuoni et al (World Scient

Physics

Quantum Physics

4 pages

Scientific paper

A quantum spin system can be modelled by an equivalent classical system, with an effective Hamiltonian obtained by integrating all non-zero frequency modes out of the path integral. The effective Hamiltonian H_eff(S_i) derived from the coherent-state integral is highly singular: the quasiprobability density exp(-beta H_eff), a Wigner function, imposes quantisation through derivatives of delta functions. This quasiprobability is the distribution of the time-averaged lower symbol of the spin in the coherent-state integral. We relate the quantum Monte Carlo minus-sign problem to the non-positivity of this quasiprobability, both analytically and by Monte Carlo integration.

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