Abstract:
Hierarchical models of quantum anharmonic oscillators with a polynomial anharmonicity and interaction decaying as (distance)-1-λ are considered. For a class of such models (including ϕ4-type anharmonicity ones), it is shown that the critical fluctuations of the position operator are absent, for all λ > 0 and all temperatures, provided the oscillators mass in less than some threshold value depending on the anharmonicity parameters. This result may be interpreted as a rigorous mathematical justification of physical arguments showing that quantum fluctuations can damp phase transitions.
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Received: 12 April 1996 / Accepted: 25 October 1996
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Albeverio, S., Kondratiev, Y. & Kozitsky, Y. Absence of Critical Points for a Class of Quantum Hierarchical Models . Comm Math Phys 187, 1–18 (1997). https://doi.org/10.1007/s002200050127
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DOI: https://doi.org/10.1007/s002200050127