Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1996-02-27
J. Stat. Phys. vol. 87, pp. 1307-1323 (1997)
Physics
Condensed Matter
Statistical Mechanics
8 pp., 3 eps figs, final version as published
Scientific paper
10.1007/BF02181286
Long-ranged, or power-law, behavior of correlation functions in both space and time is discussed for classical systems and for quantum systems at finite temperature, and is compared with the corresponding behavior in quantum systems at zero temperature. The origin of the long-ranged correlations is explained in terms of soft modes. In general, correlations at zero temperature are of longer range than their finite temperature or classical counterparts. This phenomenon is due to additional soft modes that exist at zero temperature.
Belitz Dietrich
Kirkpatrick Theodore R.
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